Which of the following describes a positron emission tomography (PET) scanner? 1: A device that uses magnetic fields to produce images of brain structures 2: A device that uses magnetic fields to measure blood flow 3: A device that uses radioactive fluid to determine the active areas of the brain 4: An X-ray device that can create a 3D model of the brain

Answer:

The answer is

Explanation:

Human brain is considered as the centre of all senses as it can control what we can do. Without our brains, we can't walk, hold things or even move a pencil. A brain has different parts which perform different functions in the body. Brain is considered to be the centre of all senses because of these following reasons.

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The human mind is the command center for the human anxious device. It receives signals from the body's sensory organs and outputs records to the muscle tissues.

Parietal lobe

It figures out the messages you get hold of from the 5 senses of sight, touch, odor, hearing, and taste. This part of the mind tells you what's a part of the frame and what is a part of the outside international.

The brain is arguably the most important organ in the human frame. It controls and coordinates moves and reactions, allows us to suppose and feel, and allows us to have reminiscences and feelings—all the matters that make us human.

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Answer:

The goal of disinfection of public water supplies is the elimination of the pathogens that are responsible for waterborne diseases. The transmission of diseases such as typhoid and paratyphoid fevers, cholera, salmonellosis, and shigellosis can be controlled with treatments that substantially reduce the total number of viable microorganisms in the water.

While the concentration of organisms in drinking water after effective disinfection may be exceedingly small, sterilization (i.e., killing all the microbes present) is not attempted. Sterilization is not only impractical, it cannot be maintained in the distribution system. Assessment of the reduction in microbes that is sufficient to protect against the transmission of pathogens in water is discussed below.

Chlorination is the most widely used method for disinfecting water supplies in the United States. The near universal adoption of this method can be attributed to its convenience and to its highly satisfactory performance as a disinfectant, which has been established by decades of use. It has been so successful that freedom from epidemics of waterborne diseases is now virtually taken for granted. As stated in Drinking Water and Health (National Academy of Sciences, 1977), "chlorination is the standard of disinfection against which others are compared."

However, the discovery that chlorination can result in the formation of trihalomethanes (THM's) and other halogenated hydrocarbons has prompted the reexamination of available disinfection methodology to determine alternative agents or procedures (Morris, 1975).

The method of choice for disinfecting water for human consumption depends on a variety of factors (Symons et al., 1977). These include:

its efficacy against waterborne pathogens (bacteria, viruses, protozoa, and helminths);

the accuracy with which the process can be monitored and controlled;

its ability to produce a residual that provides an added measure of protection against possible posttreatment contamination resulting from faults in the distribution system;

the aesthetic quality of the treated water; and

the availability of the technology for the adoption of the method on the scale that is required for public water supplies.

Economic factors will also play a part in the final decision; however, this study is confined to a discussion of the five factors listed above as they apply to various disinfectants.

The propensity of various disinfection methods to produce by-products having effects on health (other than those relating to the control of infectious diseases) and the possibility of eliminating or avoiding these undesirable by-products are also important factors to be weighed when making the final decisions about overall suitability of methods to disinfect drinking water. The subcommittee has not attempted to deal with these problems since the chemistry of disinfectants in water and the toxicology of expected by-products have been studied by other subcommittees of the Safe Drinking Water Committee, whose reports appear in Chapter III of this volume (Chemistry) and Chapter IV (Toxicity) of Drinking Water and Health, Vol. 3.

Organization of the Study

The general considerations noted in the immediately following material should be borne in mind when considering each method of disinfection. Available information on the obvious major candidates for drinking water disinfection—chlorine, ozone, chlorine dioxide, iodine, and bromine—is then evaluated for each method individually in the following sections. Other less obvious possibilities are also examined to see if they have been overlooked unjustly in previous studies or if it might be profitable to conduct further experimentation on them. Disinfection by chloramines is dealt with in parallel with that effected by chlorine because of the close relationship the former has to chlorine disinfection under conditions that might normally be encountered in drinking water treatment.

Answer:

B. The pea flowers are pollinated at random.

Explanation:

Hardy-Weinberg equilibrium states that allele and genotype frequencies will remain same in next generations without any evolutionary influence among a population.

If the pea flowers are pollinated at random, then the population will not follow Hardy-Weinberg equilibrium because random pollination give rise to variation among the population as flower will pollinate randomly and allele and genotype frequencies varies showing both tall and recessive alleles.

Hence, the correct answer is "B".

Answer:

One pea plant pollinates more flowers than the others

Sample Response: This theme is universal. It can apply to all people, and most people struggle with this question.

Answer:

because they belong in the fungi kingdom

Explanation:

Answer:

Mushrooms

Explanation:

Mushrooms belong to the fungi kingdom

Food webs show how food chains are connected and what an ecological group eats. Therefore, this scenario represents a food web.

An ecological community's food web is a graphical representation of the natural connectivity of food chains as well as the question of what consumes what in that community. The term "consumer-resource system" is another name for the "food web."

There are often two distinct kinds of food webs present in an ecosystem: a grazing food web that is supported by photosynthetic plants or algae, and a detrital food web that is supported by organisms that decompose dead matter (such as fungi).

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Answer:

1. ridges and trenches (either answer is acceptable)

2. mid-atlanitc

3. subduction zone

4. molten

5. oceanic trenches

Explain:

6. Rocks in the ocean eventually get subducted back into earths mantle due to slab pull. New rocks form at mid-ocean ridges as ridge forces two plates to diverge.

1. ridges and trenches (either answer is acceptable)

2. mid-atlanitc

3. subduction zone

4. molten

5. oceanic trenches

Explain:

6. Rocks in the ocean eventually get subducted back into earths mantle due to slab pull. New rocks form at mid-ocean ridges as ridge forces two plates to diverge.

Explanation:

Answer:

without the right amount of temperature and water photosynthesis won't take place and without the presence of carbon dioxide...there is nothing like photosynthesis

Explanation:

1) Temperature- Above 28°C of temperature photosynthesis will not take place faster as necessary. At this temperature, the enzymes responsible for photosynthesis will not work efficient as needed .  2)Water and 3)Carbon Dioxide-Water and carbon dioxide are the reactants in Photosynthesis which means they are taken in to produce energy. Six molecules of water and six molecules of carbon dioxide are needed to break apart glucose and produce energy.

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Answer:

an ecosystem. I got it right on edge 2020.

Explanation:

A scientist is conducting research about all the plants and wildlife in the Mojave Desert this scientist is studying an ecosystem.

An ecosystem is a set formed by the interactions between biotic components, such as living organisms: plants, animals and microbes, and abiotic components, chemical and physical elements, such as air, water, soil and minerals.

Broad categories of terrestrial ecosystems are called biomes. In ecosystems, matter and energy are conserved.

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Answer:

Eco friendly features are the characteristics of a car which helps to prevent and reduce water, air and land pollution to the barest minimum.

These features include Emission Sensors, LED Lights, Hybrid Engines, Radar Alerts and Air Filtration Systems.

Techniques you can use while driving any vehicle to increase fuel efficiency and reduce emissions include driving conservatively, use of speed bumps and regular maintenance.

Some eco-friendly resources that you can look for when buying your first vehicle, that it is not powered by fossil fuels, so it can be powered by electricity or hybrid, with that, it is still necessary to continue using your car correctly so as not to emit other pollutants, to know more.....

A hybrid ecological car, powered by solar energy and even electricity, brings numerous benefits to the environment. These vehicles are the ones that mix the use of electricity and fuel to move around. Generally, at low speeds, electricity is used as the main form of movement and gasoline only kicks in when high speeds are required.

The models powered by solar energy and electricity do not use fuel to move. The great advantage of this for the environment is the reduction in the emission of pollutants, such as CO2, which actively participates in the greenhouse effect and consequent global warming. With the use of ecological vehicles, our planet must become a better place to live.

With this information, we can conclude that choosing a car powered by renewable energy is the best option to choose, to maintain the ecological balance and health of the planet.

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Answer:

Biosphere comprises all the living components of the Earth. It also includes organic matter that has not yet decayed.

Explanation:

A theory known as the ecosystem better explains the interaction of the biosphere with the other spheres.

Answer:

Most food modifications have primarily focused on cash crops in high demand by farmers such as soybean, corn, canola, and cotton. Genetically modified crops have been engineered for resistance to pathogens and herbicides and for better nutrient profiles.

Explanation:

Answer:

The correct answer is option d, that is, hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.

Explanation:

The maximum growth temperature refers to the highest temperature at which growth can take place. Let us take an example of bacteria, it is found that each bacterial species possess a requirement of specific growth temperature, which is mainly determined by the requirement of the temperature of its enzymes. Each of the organism exhibits an optimum growth temperature, a minimum growth temperature, and a maximum growth temperature.  

When for an organism, the temperature goes more than its maximum growth than it results in the dissociation of the hydrogen bonds, denaturation of the proteins, and even the membranes become too fluid. This can even result in the death of the species. However, there are some of the organisms, which can thrive high temperatures known as thermoduric organisms, but they fail to grow effectively at such temperatures.  

Answer:

Platypus is an mammal.

Explanation:

Because platypus cannot fly, and lays eggs. It does not live in nests, but in holes on the ground. The parents platypuses can have venom but the smaller ones do not have venom. This is why they are threatened by other animals.

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Answer:

40

Explanation:

given

product of two numbers =160

hcf =4 we know that

hcf*LCM=product of the numbers

LCM*4=160

LCM=160/4

LCM=40

Answer:Geochemistry  is about the chemical connection with the earth. On the other hand, geophysics is concerned with the physical relation with the earth.

Explanation:

Answer:

The options are

A) there are too many pronghorn predators outside North America.

B) its temperature requirements are stringent and not met outside North America.

C) it is a relatively new species in evolutionary terms.

D) its nutritional requirements cannot be met outside this region.

E) it has never dispersed beyond this region.

The answer is E) it has never dispersed beyond this region.

The pronghorn antelope resides in temperature grassland biomes of North America. The reason pronghorn antelope are not found outside of North America is most likely that it has never dispersed beyond this region which could be due to the suitability of the environment to their survival.

Answer: A. bacteria

Explanation: because we know that nitrogen fixingbacteria's fix as ammonia to made available for the plants

Answer:

1. A person sitting on a chair.

2. Water in a bucket.

3. Bus without a driver.

4. Electric fan without electricity.

5.Car without engine.

Answer:

Meteor → a streak of light

Explanation:

Got it right on the test

A meteor is a streak of light.

The sun and the group of celestial bodies that are bound by gravitational force form a solar system. It was formed about 4.6 billion years ago.

A comet is a relic covered with dust, rock, and ice. It was formed during the solar system's formation. They have a diameter ranging from a few miles to tens of miles.

They are either metallic or rocky bodies and do not have atmospheres. Asteroids come in a variety of sizes and forms.

Planets are massive astronomical bodies that are neither stars nor remains of stars. They have an orbit and there are 8 planets in our solar system.

A meteor appears as a bright streak of light in the sky. It is a space rock that enters the earth's atmosphere. It is often known as a shooting star or falling star.

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1) An eclipse takes place when one heavenly body such as a moon or planet moves into the shadow of another heavenly body. There are two types of eclipses on Earth:

2) Most years have 4 eclipses, which is the minimum number of eclipses that take place in a year; 2 of these 4 eclipses are always solar eclipses. While rare, the maximum number of eclipses that can take place in a calendar year is 7.

3) Differences:-

4) Moon phases:

We only see the Moon because sunlight reflects back to us from its surface. During the course of a month, the Moon circles once around the Earth. If we could magically look down on our solar system, we would see that the half of the Moon facing the Sun is always lit. But the lit side does not always face the Earth! As the Moon circles the Earth, the amount of the lit side we see changes. These changes are known as the phases of the Moon and it repeats in a certain way over and over.

5) The moon moves in an orbit around Earth, and at the same time, Earth orbits the sun. Sometimes Earth moves between the sun and the moon. When this happens, Earth blocks the sunlight that normally is reflected by the moon. Instead of light hitting the moon’s surface, Earth's shadow falls on it. This is an eclipse of the moon -- a lunar eclipse.

Sometimes when the moon orbits Earth, it moves between the sun and Earth. When this happens, the moon blocks the light of the sun from reaching Earth. This causes an eclipse of the sun, or solar eclipse. During a solar eclipse, the moon casts a shadow onto Earth.

6) The moon can look red during a total lunar eclipse because of sunlight that's filtered and refracted by Earth's atmosphere.

7) 50% of the lunar surface is always illuminated by Sun. Because half of the moon surface is lit, rest we can't see.

8) When the moon passes between the sun and Earth, it can create a solar eclipse. When the disk of the moon masks the disk of the sun, it creates a total solar eclipse. Lunar eclipses occur when Earth passes between the sun and the moon. During a lunar eclipse, the moon turns dark red due to the deviation of the sun's rays caused by Earth's atmosphere. Lunar eclipses occur more often and last longer.

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Answer:

C. glycoproteins

Explanation:

Glycoproteins are proteins containing glycans (oligosaccharide carbohydrates) attached to amino acid side chains. These oligosaccharides are attached to the amino acid chain by a posttranslational modification referred to as glycosylation, a modification generally found in extracellular regions. Glycosylation refers to the chemical reaction in which a glycosyl donor (i.e., the carbohydrate) is attached to a functional group in the protein. The glycosylation sites play distinct functional roles for both cell interactions and cell recognition. Moreover, glycosylation sites are also essential for substrate recognition by an enzyme. For example, secreted cytokines are glycosylated, which is required for their binding to receptors.

Answer:

H+ protons will not be delivered from the cytoplasm towards the extracellular side of the cell membrane

Explanation:

ATP synthases are enzymes that catalyze the hydrolysis of phosphate bonds in the adenosine triphosphate (ATP) or the formation of ATP from adenosine diphosphate (ADP) and phosphate. The hydrolysis of ATP produces the rotation of a ring composed of six or more structurally different ATPase C subunits. The rotation of this ring enables the delivery of H+ protons towards the extracellular membrane surface and this gradient is used to generate energy by producing ATP. In consequence, when the ATPase ring can not move, H+ will accumulate in the cytoplasm, the proton gradient through the membrane will not occur, and ATP will not be produced.

East or South side is best

Explanation:

Roses do best in full sun and morning sun is the best place. so always plant roses the along an east wall or south side of your home

Answer:

Passive transport.

Explanation:

Osmosis occurs in the cell which is a type of passive transport. Passive transport refers to the transfer of solutes from one place to another without the expenditure or use of energy. Osmosis refers to the transfer of solutes from outside the cell into inside the cell through a semipermeable membrane which allow solutes which are small in size. This process occurs only when the concentration of solute is different inside and outside of the cell. while active transport is a type of transport which transfer solutes from one place to another with the use of energy in the form of ATP.

Answer:

(menstrual phase) this is the phase where the unfertilized ovum and endometrium that was formed in readiness for implantation slough off or come out due to a sudden drop in progesterone levels

(follicular phase) this is where the graafian follicle in the ovary develops. from primary follicles due to secretion of follicle stimulating hormone by the pituitary gland and matures there after due LH hormone which will also stimulate the ovary to release the ovum

(luteal phase)this is the phase after the ovum has been released where the remains of the ruptured graafian follicle undergo reorganization to form a corpus luteum/yellow body which now produces progesterone which causes thickening of endometrium in readiness for implantation

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Answer:

The menstrual cycle is the regular natural change that occurs in the female reproductive system that makes pregnancy possible. 2) The follicular phase is a phase of the estrous cycle during which follicles in the ovary nature from primary to a fully mature grafian follicle.It ends with ovulation.3) The luteal phase begins during the second half of a menstrual cycle normally lasting around 12 14 days after the ovulation and it is responsible for producing progesterone.

Answer:

B. The density of the population.

Explanation: