What best describes the role of molecular oxygen (O2) in cellular respiration? A. It is accepts electrons when reacting to form water. B. It combines with carbon and hydrogen to form glucose. OC. It is released when water breaks apart. D. It is released when glucose breaks apart. OE. It reacts to form carbon dioxide and water.​

D. It is released when glucose breaks apart.

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the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

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