How did the mass extinction that killed the dinosaurs affect the evolution of mammals?
Answer:
With dinosaurs no longer eating them, mammals made quick evolutionary strides, assuming new forms and lifestyles and taking over ecological niches vacated by extinct competitors. ... Sixteen mammal species were discovered, with skulls and other bones fossilized after being buried in rivers and floodplains.
Explanation:
To obtain the atomic weight in an atom, add the:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons
Sickle cell anaemia is an inherited autosomal recessive
condition caused by a mutation in the haemoglobin
subunit beta (HBB) gene. A male and female who are
phenotypically normal, discover through genetic testing
that they are both carriers of a HBB mutant allele. What is
the probability that their first child will be biologically
female and phenotypically normal?
Answer:
1/8 (12.5%)
Explanation:
An autosomal recessive disease is an inherited disease in which an individual need to receive both defective alleles at the same gene locus to be expressed in the phenotype. In this case, both parents are carriers of the recessive mutant allele associated with the sickle cell anaemia trait, thereby both parents are heterozygous, ie., each parent has one copy of the normal allele 'H' and one copy of the defective mutant allele 'h' associated with this condition. In consequence, their first child has a 1/4 (25%) chance of having sickle-cell anaemia. Moreover, the chance of having a girl is 1/2 and the chance of having a boy is 1/2, thereby the final chance of having a girl sickle cell anaemia individual is 1/4 x 1/2 = 1/8 (12.5%).
- Parental cross for sickle cell anaemia trait = Hh x Hh >>
- F1 = 1/4 HH (normal); 1/2 Hh (normal); 1/4 hh (sickle cell anaemia) >>
- Sex proportion of sickle cell anaemia individuals = 1/8 female sickle cell anaemia individuals + 1/8 male sickle cell anaemia individuals (1/8 + 1/8 = 1/4)
difference between trychocysts and nematocysts
Answer:
trichocyst is a threadlike organ in certain protozoans that can be discharged suddenly in order to grasp or sting while nematocyst is (biology) a capsule, in certain cnidarians, containing a barbed, threadlike tube that delivers a paralyzing sting.
Explanation:
What things do plants use to get food matter?
HELP ASAP
Answer:
water and sunlight (for sure)
Answer:
Plants are called producers because they make their own food
Explanation:
Plants use minerals and water from the ground and their leaves absorb Carbon Dioxide (CO2) from the air.They convert these into food by using sunlight
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An organism is born with a genetic variation not present in any of its ancestors. This variation is most likely the result of
A.circulation of blood
B.competition among individuals
C.respiration
D.a mutation in its DNA
Answer:
D
Explanation:
This is because circulation is blood,respiration and competition have no relation to changing the DNA of an organism
which player will generate the most FORCE??!!!
Answer:
Nick Boyle as 270 pounds is higher than others!
Explanation:
Answer:
Logan Thomas
Explanation:
Which statement best describes how molecules interact with systems in the
human body
A. Carbon atoms combine with water to form the glucose molecules
that cells use to get the energy they need.
B. Oxygen molecules in the blood enter the cells of all body systems,
and the cells use them to get energy
C. Carbon dioxide molecules leave the body in exhaled air, and
oxygen molecules enter the body in inhaled air.
D. Oxygen molecules help carry other molecules in the blood as it
flows through the body.
Answer:
b
Explanation:
A 10 N force and a 15 N force are acting on a box in opposite directions what edition force must be added to produce equilibrium
Answer:
5N of force acting the same way as the 10N of force to make it 15N of force
Explanation:
Groundwater _____. forms when precipitation seeps into the soil exists above the earth's surface is impossible to pollute is not a usable water source for humans
Answer:forms when precipitation seeps into the soil
Explanation:
Answer:
It's B
Explanation:
I got it correct when I did it on my quiz on oddseyware.
Which of the following is formed last in daughter cells when plant cells divide?
The nucleus
The nuclear envelope
The cell membrane
The cell wall
Answer:
The cell wall is formed last
Answer:
the nucleus is the last thing formed
Woolly mammoths are an extinct species of elephant that lived in very cold climates.
They had very small ears.
Compared with the large ears of modern elephants, small ears would have assisted in
survival of the mammoths by
A. Decreasing the core body temperature
B. Increasing the effects of heat conduction
C. Increasing the radiation of heat from the body
D. Decreasing the surface area through which heat is lost
Answer:
The answer is B: Increasing the radiation of heat conduction
Which is a reason why wetlands are important?
O They move water to higher ground during flooding.
O They filter pollutants out of water.
O They are estuaries.
O They provide minerals.
Answer:
They are estuaries
Explanation:
Plants and animals are multicellular organisms made of organ systems that work together to maintain homeostasis. Body systems
are made of organs and organs are composed of tissue. Tissues are groups of cells that work together to perform functions.
Examine each of the examples below. Which of these are organs found in plants or animals? Select ALL that apply.
A
A
)
epithelial
B)
eye
leaf
D)
stem
vascular
The organs found in plants or animals is stem vascular. Therefore, option (D) is correct.
What are the features of the stem vascular?A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, stores nutrients.
The vascular system of plants, complete with xylem and phloem, fills both purposes. Stems, along with roots, also store food for the plant. Pith, a tissue that lies in the center of the stem.
A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in the stem, which exists in two forms: xylem and phloem.
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Is the chief justice of the supreme court the commander in chief of the military
No , The Chief Justice of the Supreme Court is not the Commander in Chief of the Military .
the chromosomal hereditary material is packaged in this organelle in eukaryotic cells but not in prokaryoitc cells. This organelle is called
Answer:
Nucleus
Explanation:
The correct answer would be the nucleus.
The nucleus is a double membrane organelle that is found in all eukaryotic cells but not in prokaryotic cells. It contains the chromosomal hereditary material of eukaryotic cells and serves as the control center of the cell where other cellular activities are dictated.
The chromosomal hereditary materials of prokaryotic cells lie freely within the cytoplasm unlike what is obtainable in eukaryotic cells. The materials are package in a condensed fashion within the eukaryotic nucleus to form a structure known as chromatin. During cell division, the chromatin decondenses and become visible under the microscope as chromosomes.
Eubacteria and archaebacteria differ in the process of protein synthesis. What is the difference?
A.) phenylalanine is added as the first amino acid during protein synthesis
B.) Methionine is added as the first amino acid during protein synthesis
C.) Formyl-methionine is added as the first amino acid during protein synthesis
D.) Glutamic acid is added as the first amino acid during protein synthesis
Answer:
A
Explanation:
The main difference between Archaebacteria and Eubacteria is? Hint: Archaebacteria are called ancient bacteria whereas eubacteria are called true bacteria. Unlike eubacteria, archaebacteria can survive in extreme conditions
What happens to a population when immigration increases?
A. The population size usually increases.
B. The emigration rate usually increases.
O C. The emigration rate usually decreases.
O D. The population size usually decreases.
Answer:d
Explanation:
When immigration increases, the population size usually increases, as shown in Option A, as immigration is the movement of individuals into a population from another population.
What is immigration?Immigration is the movement of individuals from one population to another. It involves the addition of new individuals to the population, which can increase its size. When more individuals enter a population, they bring with them new genes and genetic diversity, which can enhance the adaptive potential of the population. This can help the population better withstand environmental challenges and increase their chances of survival, but increased immigration can also have negative consequences. For example, it can lead to competition for resources among individuals, which can lead to a decrease in the quality and availability of resources for the population as a whole.
Hence, when immigration increases, the population size usually increases, as shown in Option A.
Learn more about immigration here.
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Which RNA base pairs with the adenine in DNA?
Thymine
guanine
cytosine
uracil
Answer:
uracil
Explain: it pairs up with the dna
Cierta especie de plantas varía en la forma de los bordes de sus hojas. Algunas de las plantas tienen hojas con bordes ondulados y algunas plantas tienen hojas con bordes rectos. En esta especie de plantas, un gen controla el rasgo de la forma del borde de la hoja. L representa el alelo dominante y I representa el alelo recesivo. Dos plantas con hojas de bordes ondulados se cruzan una con otra, produciendo 421 plantas. De las cuales, 298 plantas tienen hojas con bordes ondulados y 123 tienen hojas con bordes rectos. 3 ¿Cuáles son los fenotipos de las plantas madre en este cruce? А Lly II B Lly Ll C LL y ll DL y Ll
Answer:
A. Lly
Explanation:
Creo que esto es correcto, pero No sé si esto es correcto
Explain the role of PERISTALSIS during your food’s time in the esophagus as it travels to the stomach.
Peristalsis helps in storing food, breaking down food down and mixing it with juices secreted by stomach lining. Peristalsis in stomach helps in partial digestion of food called chyme.
Snake venom contains a mixture of enzymes, which include phospholipase that break down cell membranes, proteinases that destroy proteins, as well as amino acid oxidases and nucleotidases that break down the monomers for protein and DNA synthesis, which is why they can be so deadly. If you were bitten by a venomous snake you may be treated with an antivenom. In addition to antibodies that help your immune system recognize and fight the foreign molecules, what else does the antivenom most likely contain
Answer:
The correct answer is - Venom enzyme inhibitors.
Explanation:
The snake venoms are the complex mixtures of phospholipase A2s, disintegrins, serine proteases, C-lectins, and metalloproteases, and others. The snake venom phospholipase A2s (svPLA2s) enzymes found in most of the families of venomous snakes that cause anticoagulant effects, cardiotoxicity, neurotoxicity, and cytotoxicity, and other effects.
In antivenom, there are Venom enzyme inhibitors other than antibodies that help in neutralizing these enzymes by weakening or inhibiting these toxic actions.
which occurs during transition ?
When a bat is hibernating, how fast does its heart pump?
Answer:
20 beats per minute
Explanation:
Answer:20 beats
Explanation:bat's heart rate slows to only 20 heartbeats per minute.
which statement regarding these methods of reproduction is correct?
Answer:
put the picture of the question
Explanation:
i cant help you if you dont
Answer this question please
Answer:
Any animal that is not a equine, tapir, or rhino.
Explanation:
There are 3 extant families of odd toed ungulates:
Equidae (horses, donkeys, zebras etc)Rhinocerotidae (rhinoceroses) Tapiridae (tapirs).If the animal isn't in one of those families, it isn't an odd toed ungulate.
What two genes a person actually has in their DNA; i.e. DD, Dd, or dd
A.genotype
B.phenotype
C.dominant
D.recessive
What types of materials could be broken dowr in a compost pile? A all recyclable materials B biodegradable materials C all materials that can be incinerated D glass, metal, and other raw materials
Answer:
All biodegradeable materials.
Plz do 6 and 9❤️❤️❤️❤️❤️ Plz
Answer:
no
Explanation:
State your claim. Make sure your claim fully explains how infrared photography can be used to visualize temperature differences
Answer:
Infrared thermography using an infrared camera is the most popular technique for detecting surface temperature without contact. ... Passive thermography measures relevant temperature differences of the surface by heating it with lamps (heat sources).
