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liraira [26]
3 years ago
5

What gas do some scientist think was missing from earths early atmosphere

Biology
1 answer:
salantis [7]3 years ago
3 0
I think the answer is oxygen, but not 100% sure
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Common ancestors only exist within a single species.
puteri [66]

<u>Answer:</u>

<em>It is not true to say that common ancestors occurs only within a single species rather two species with similar traits might have a common ancestor. </em>

<u>Explanation:</u>

If the ancestor is same for both the species then it is said that both the species are closely related and share common ancestor with similar evolutionary relationship.

Phylogenetic tree are drawn and studies are done to understand the ancestor of a species. The evolution has occurred from the ancestor to the new species formed.

6 0
3 years ago
The name of the glial cell that covers the capillaries in the brain with its perivascular feet, helping to form the blood-brain
blsea [12.9K]

Answer:

Astrocytes

Explanation:

Astrocytes are the most numerous cell type within the central nervous system (CNS) and they perform a myriad of tasks ranging from axon guidance and synaptic support, to the control of the blood brain barrier and blood flow.

4 0
3 years ago
Which one of the following events occurs first in a nerve impulse
bazaltina [42]
<span>Since you left off the choices, I have to just present the facts of what occurs first in the nerve impusle. The first thing that will is happen is the sodium ios will move to the inside of the nueron. The second step is the potassium ions will move to the inside of the neuron. After those move into the nueron, calcium will then move into the nueron. Both the sodium and potassium have 1 postive charge. While the calcium ion has 2 positive charges. </span>
5 0
3 years ago
Which of the following nerves is responsible for hearing and balance?
jeka94

Answer:

b. Vestibulocochlear nerve

Explanation: is correct

5 0
3 years ago
in the dna in chromatin, substitution mutations: a. are at a maximum in the nucleosomes b. are rarely seen, but deletion mutatio
Gelneren [198K]

In chromatin, substitution mutations are most common in linker regions. Option d is the correct answer.

Mutation by substitution When one nucleotide base is replaced by another, this occurs. Mismatch mutation A type of substitution mutation in which a single nucleotide is replaced, resulting in the coding of an incorrect amino acid, which usually results in a malfunctioning protein. Silent mutations are the result of genetic code redundancy (degeneracy): This is false, as silent mutations are the result of a base substitution that has no discernible effect on a protein's amino acid sequence.

Learn motre more about subsitution here:

brainly.com/question/29383142

#SPJ4

7 0
1 year ago
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