Which shows the best connection between the digestive and excretory systems?

The digestive system fuels the cells and the excretory system rids the body of the cells’ waste.
The digestive system rids the body of the cells’ waste and the excretory system fuels the cells.
The digestive system does physical digestion while the excretory system carries out chemical digestion.
The digestive system carries out chemical digestion while the excretory system does physical digestion.

Answer:

Natural Selection & Fitness

Explanation:

Horses have evolved to run as fast as possible because they are prey animals.

The hooves give advantages to the predecessors to the modern horse rather than the foot-bearing horses.

Thus when somebody inevitably becomes a snack, the hoof bearing horses lived longer. (Natural selection)

Because they've lived longer, they've had more babies. (Fitness)

Their babies are more likely to pass on the genes they've inherited from their successful parents, and the population of hooved-horses begins to exceed the population of footed-horses.

In this circumstance, all the footed-horses are gone. The population has evolved.

Hope this helps <3

PS: here's a source! https://www.amnh.org/exhibitions/horse/the-evolution-of-horses/on-your-toes#:~:text=Hooves%20and%20long%20legs%20help,many%20horses%20retained%20three%20toes.

Answer:

The second one and the third

Explanation:

Answer:

B. Decomposers

Explanation:

i hope this helps ;)

Decomposers,such as bacteria, breakdown dead organisms and release nutrients back into the soil.

Answer: G. Horses slowly developed over time

Explanation:

Answer: A

Explanation:

G is opposed to C

And C is opposed to G

T is opposed to A

And A is opposed to T

Answer:

I think bacterial cell becausea microscope look into small organisms that we can't see with a naked eye

Answer:

the troposphere contains three-quarters of the mass of the entire atmosphere. The air here is 78% nitrogen and 21% oxygen. The last 1% is made of argon, water vapor, and carbon dioxide.

Explanation:

Answer:

c

Explanation:

it uses percentages, like 50% Aa, 25% aa and 25% AA

Answer:

option (C) is your answer

I hope it's helps you

Answer:

C.

Explanation:

I am so sorry if I'm the wrong answer.

Answer:

Variation occurs in species with the genes resulting in the traits and physical characteristics that make it possible for them to be among the fittest for a number of reasons:

1. Mutation

2. Recombination and

3. Migration

Explanation:

Mutations:  A mutation is a deviation from the norm in a DNA sequence. It can be stimulated by errors during the DNA replication process which happens as the cell is dividing, or by exposure to ionizing radiation, chemicals, or viral infection (whether artificial or natural).

It is noteworthy that naturally, without any human intervention, the possibility of a spontaneous mutation is very low.

Recombination: This refers to the creation of new fusion of genes in the offspring that did not occur in the parents by the processes of crossing-over and independent assortment. Independent assortment meaning that the allele the gamete received for one gene was not influenced by the allele received for another gene.

Migration: Variation by migration here refers to the introduction of new genes from into one population by another. This could happen when a new population arrives at an existing one or when an existing one migrates to another population.

We can say for example that, genes from Americans have “migrated” into the population of African origin in America given the continuous immigration of Africans into America.

So in both populations, there are very fit species, but when their genes are mixed during cross-reproduction, variation arises.

Cheers

Answer:

Not really sure about this question but what I think is,

So for example, metal..Metal has a very low specific heat capacity, but we use it pretty much in all our lifetime right? Things that have low heat capacity have very high capacity if that makes sense. Things like water and oil, they take more energy to get heat up or get hot. Its funny because its what makes our planet survivable. 70% of our planet is of course water and radiation (light and heat) from the sun strikes 70% of water. Meaning its not heating anything up so quickly. Hope this somewhat helps you out and gives you an idea on what the question is talking about :) Enjoy!

Explanation:

Answer:bsna

Explanation:

Answer:

Human use of land has negative impacts. Human activities contribute to the erosion and pollution of beaches. ... More of the rainwater runs off leading to increased erosion and drier soil. Deforestation of land can also lead to desertification and a loss of biodiversity.The burning of fossil fuels and the growth of animal agriculture has led to large amounts of greenhouse gases (such as carbon dioxide and methane) in the atmosphere. Higher concentrations of greenhouse gases trap more heat in the biosphere and result in global warming. In turn, this drives climate change.Humans affect the quality, availability, and distribution of Earth's water through the modification of streams, lakes, and groundwater . ... The activities of humans have significantly altered the biosphere , changing or destroying natural habitats and causing the extinction of many living species.

Explanation: (:

High CO2 levels cause plants to thicken their leave ,which could worsen climate change effect researchers says.

plant scientists observed that when CO2 levels increase in the atmosphere most plants do unusual , they thicker their leave

germination increase in high temperature up to the point

Increased CO2 levels and temperatures affect plant growth by bringing about a corresponding increase.

This the process in which plants manufacture their food through the presence of sunlight.

other compounds such as CO2 and water are used which is why increase in the CO2 levels and temperatures will increase the growth of plants.

Read more about Photosynthesis here https://brainly.com/question/19160081

Answer:

C

Explanation:

because the human population is constantly rising and it has become a problem because we are using up our resources. linear means it stays the same. slowing means it's going down more than up and exponential means it is continuously going up

Answer:

Explanation:

I dont get the question its just a chart

Answer:

I think option B is right answer

Answer:

B) Image 1 -> Image 3 -> Image 4 -> Image 2

Explanation:

The pictures of the ecosystems are needed to be put into the simplest -> complex order.

Image 1 could be the simplest as it only has one organism.

Image 3 would be the next simplest as it has only a group of the same organism.

Image 4 would come next as it has aqua life and surroundings but the same fishes!

Image 2 would be the most complex, as it has various biodiversity and surroundings!

The order would go as Image 1 -> Image 3 -> Image 4 -> Image 2.

Explanation:

The exoskeleton and molting

The success of arthropods derives in large part from the evolution of their unique, nonliving, organic, jointed exoskeleton (see figure), which not only functions in support but also provides protection and, with the muscle system, contributes to efficient locomotion. The exoskeleton is composed of a thin, outer protein layer, the epicuticle, and a thick, inner, chitin–protein layer, the procuticle. In most terrestrial arthropods, such as insects and spiders, the epicuticle contains waxes that aid in reducing evaporative water loss. The procuticle consists of an outer exocuticle and an inner endocuticle. In the exocuticle there is cross-bonding of the chitin–protein chains (tanning), which provides additional strength to the skeletal material. The hardness of various parts of the exoskeleton in different arthropods is related to the thickness and degree of tanning of the exocuticle. In crustaceans, additional rigidity is achieved by having the exoskeleton impregnated with varying amounts of calcium carbonate.

arthropod integument

arthropod integument

Diagrammatic section through the arthropod integument.

Encyclopædia Britannica, Inc.

The formation of an exoskeleton required the simultaneous solution of two functional problems in the evolution of arthropods: If the animal is encased in a rigid covering, how can it grow and how can it move? The problem of growth is solved in arthropods by molting, or ecdysis, the periodic shedding of the old exoskeleton. The underlying cells release enzymes that digest the base of the old exoskeleton (much of the endocuticle) and then secrete a new exoskeleton beneath the old one. At the time of actual shedding, the old skeleton splits along specific lines characteristic of the group, and the animal pulls out of the old skeleton as from a suit of clothes. The old skeleton is usually abandoned but in some species is eaten. The new exoskeleton, which is soft and flexible, is then stretched by localized, elevated blood pressure augmented by the intake of water or air. Hardening occurs by stretching and especially by tanning within a number of hours of molting. In crustaceans, calcium carbonate is deposited into the new procuticle. (Soft-shell crabs are simply newly molted crabs.) Additional endocuticle may be added to the exoskeleton for some days or weeks following molting.

molting

molting

Grasshopper shedding its exoskeleton.

© Cathy Keifer/Dreamstime.com

Molting is under hormonal control, and there is a long preparatory phase that precedes the process. The steroid hormone ecdysone, secreted by specific endocrine centres and circulated in the blood, is the direct initiator of molting. The actual timing of a molt, however, is regulated by other hormones and commonly by environmental factors. The interval between molts is called an instar. Because of the frequency of molts, instars are short early in life but grow longer with increasing age. Some arthropods, such as most spiders and insects, stop molting when they reach sexual maturity; others, like lobsters and crabs, molt throughout their lives. Most of the larger spiders of temperate regions, for example, molt about 10 times before reaching sexual maturity. As a result of molting, the length and volume of an arthropod display steplike increases over the life span, but internal tissue growth is continual as in other animals.

Loss of a limb is a common hazard in the life of many arthropods. Indeed, some arthropods, such as crabs, are capable of amputating an appendage if it is seized by a predator. The limb is then regenerated from a small, nipplelike rudiment formed at the site of the lost limb. The new limb develops beneath the old exoskeleton during the premolt period and then appears when the animal molts.

Answer:

Three layers

Explanation:

Outer= Composed of proteins and lipids. Repels water and prevents desiccation in terrestrial places.

Middler=Provides primary protection

Inner=Flexibke at joints, muscles attach here.

Answer:

2.1: Anaphase

2.2: synthesis phase

2.3: Meristematic tissue

2.4: Interphase

2.5: cleavage furrow

2.6:  pericentriolar material

Explanation:

Answer:

As an embryo develops, identical cells give rise to specialized cells that perform different functions.

Explanation:

As an embryo develops, the cells divide, giving new ones. As the cells grow and continue to reproduce themselves, they differentiate, becoming specialized cells. These cells will be located in a particular part of the embryo and will perform a specific function. The shape, size, and organelles vary according to their role.

Answer:

Ozone molecules in the stratosphere are constantly being produced and destroyed by different types of UV radiation from the sun. ... However, scientists have discovered that certain chemicals react with UV radiation in the stratosphere, which causes them to break apart and release chlorine or bromine atoms.

Explanation:

Explanation:

it's very reactive which helps to make strong bones

Answer:

DNA cannot leave the nucleus because that would risk it getting damaged.

Answer:

it's either be or see because it's more soluble with water the sense the Arctic Ocean is you know near the Arctic which would be like more North Pole and it be really cold and Frozen it's more contact with just normal water so I'm pretty sure the North Atlantic Ocean so c

Answer:

Request a refund for recent purchases · It's less than 48 hours since you bought an app or made an in-app purchase,

Answer:

D. several million years

Explanation:

find the velocity of the spacecraft:

6 ÷ 2 = 3 AU per year

the time for the spacecraft to travel to Wolf 359:

492,000,000 ÷ 3 = 164,000,000 = several million years

Answer:

C

Explanation:

I just did this same question

Virus-infected cells produce interferons that lead to the inhibition of viral replication and act as a nonspecific response of the immune system in fighting viral infections. Therefore, the correct statement is option D.

The immune system has two types of responses to viral infections: specific and nonspecific. Interferons are signaling molecules produced by virus-infected cells to activate antiviral defenses, such as apoptosis in infected cells. This refers to the nonspecific response of the immune system in fighting viral infections

Interferons function by alerting the immune system about the presence of a viral infection. Interferons can also stimulate the production of other immune cells, such as natural killer cells and macrophages to eliminate the infected cells.

Interferons have been also used to treat viral infections, such as hepatitis B, and are the nonspecific defenses that act as a first line of defense against viral infections.

Therefore, interferons that lead to the inhibition of viral replication are the nonspecific response of the immune system in fighting viral infections.

Learn more about the interferons here:

https://brainly.com/question/31376665

#SPJ2

Answer:

C. Calcium (CA)

Explanation:

other Alkaline Earth metals in period 4 are, beryllium (Be), magnesium (Mg), strontium (Sr), barium (Ba), and radium (Ra)

Answer:

calcium is part of the alkaline earth metals family