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Elodia [21]
3 years ago
11

Which of these is a hollow ball of cells that develops after the fertilization of the egg?

Biology
1 answer:
BabaBlast [244]3 years ago
4 0
<span> After fertilization, the </span>zygote<span> undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form.</span>
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In assembling a nucleosome, normally the …(1) histone dimers first combine to form a tetramer, which then further combines with
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Answer:

option 1

Explanation:

In assemblying the nucleosome, this reaction occurs in two main steps. the H3 and H4 are recruited first to the DNA in pairs forming the H3/H4 tetramer; meaning two of H3 and two of H4. This gives rise to the nucleosome precursor. Then after this, the dimers of both H2A/H2B are recruited to this precursor, to give rise to the octamer structure around which the DNA is wrapped.  

7 0
3 years ago
An energy pyramid shows the amount of_______<br> available at each feeding level in an ecosystem
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Answer:

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An energy pyramid shows the amount of energy available at each feeding level in an ecosystem.

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3 years ago
Which enzyme removes rna primers and fills in gaps in small regions of dna where the rna primers were located?
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3 years ago
Please help me with this question. at least 7 sentences. don’t copy and paste from google.
Darya [45]

<u>Answer:</u>

Fossils are the sources to learn the changes on the earth and how much it changed in these years. Its provides us with information about the existence of plant and animals in the past.

Actually, the fossils we found till the date are the ancestors of the plants and animals that live today.  Moreover, some fossils of animals are easily identifiable since they exist till the date.  

But there are fossils of animals that exist no longer in the earth. By studying and analyzing the fossils, one can tell how life on the earth has changed.

Also, we can learn about the ancestors of the plants and animals and how their long life existed on earth.

In other words, one can learn where and how those organisms were lived. So that we can know about our ancient environments.

6 0
3 years ago
Modern Native Americans have very high frequencies of Type O blood. In some places in North and South America, the frequency is
Brilliant_brown [7]

Native Americans and Type O Blood

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In some places in North and South America, the frequency is as high as 100%. Anthropologists believe that early Native Americans arrived in North America by crossing over the Bering Land Bridge around 15,000 years ago, from East Asia.

Modern East Asian populations, with whom modern Native Americans share ancestry, do not have high frequencies of Type O blood. Instead, they have some of the lowest frequencies of Type O blood in the world.

B. Sickle-Cell Anemia

As many as 20-30% of people living in equatorial Africa have at least one allele on Chromosome 11 that codes for sickle-cell anemia (they have an, "S" rather than an, "A" allele). This is odd because usually, 80% of people who have two S alleles die before they can reproduce,

For each of the following cases:

1. What forces of evolution are at work?  State all that apply.

Mutation

Natural Selection

Genetic Drift

Gene Flow.

Learn more about Anthropologists at

brainly.com/question/13728734

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8 0
2 years ago
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