Answer:
Rocks.
Explanation:
Scientists study rocks from the Precambrian period because isn't really a significant fossil record from the Precambrian.
This is an example of <em><u>natural selection</u></em> in action.
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Fatty acids are the building blocks of fat in the body and food. <span>They are organic acids, carbon chains with at least one</span> carboxyl group (COOH).
Fatty acids are essential in order the human body to function normally. <span>These fatty acids are called Essential Fatty Acids and are involved in the process of building healthy cells, maintaining brain and nerve function.</span>
In humans, oxygen is delivered to the cells of the body by the circulatory system.
Hope this helps !
Photon
<span>Cells use the Adenisine Ttri Phosphate energy by aerobic and anaerobic reactions. Hope this helps :)</span>
