Answer:
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Explanation:
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The earth's atmosphere consists mainly of nitrogen and oxygen with smaller proportions of other gases such as carbon dioxide. The amount of carbon dioxide in the atmosphere is maintained through a balance between processes such as photosynthesis, respiration and combustion. However this balance is being affected by human activities which are polluting the atmosphere.
The proportion of these gases in the atmosphere is as follows: nitrogen is the most abundant at 78%, oxygen is next at 21%, while others include carbon dioxide at 0.037% and argon at 0.9 % .
Answer:
<h2>Yes, mammals are more closely related to reptilia or birds </h2><h3>Hope it helps </h3>
Essential amino acids are amino acids that must be supplied to one's body by their diet because they cannot be synthesized from scratch.
1) Store the cells DNA
2) Control cell division and cell growth
