Vestigial structures<span> are often homologous to </span>structures<span> that are functioning normally in other species</span>
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Answer: The cell is the structural and functional unit of all living organisms, and is sometimes called <u>the "building block of life."</u> Some organisms, such as bacteria, are unicellular, consisting of a single cell.
When blood ph is above normal range, it is a condition called, alkolosis. When blood ph is below the normal range, it is a condition called acidosis.
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I think the correct answer is A
