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Asexual organisms produce clones of themselves. That leaves the organism prone to being wiped out in its entirety, because every individual is equally in trouble when danger strikes. A virus or predator that affects one affects them all. It has no possibility of exploring new places, new foods, new methods of escape.
Souce: https://www.quora.com/Why-dont-all-organisms-reproduce-asexually
Biological reactions can be classified as being of two main types: anabolic and catabolic. Catabolic reactions involve the break down of a larger molecule to release energy and smaller molecules; meanwhile, anabolic reactions are the opposite such that they involve the combination of molecules while consuming energy to form larger molecules.
Muscle growth is anabolic because polypeptides are formed using amino acids and energy.
<span>The cell requires a barrier between itself and its environment.</span>
Allopatric <span>speciation!
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