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Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.
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According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes
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The same secondary messengers molecules are used in many types of cells, but the response to a speci...
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