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5 November, 13:02

What evolutionary changes were essential to the development of complex body plans?

A. mobility

B. internal fertilization

C. tissue and cell differentiation

D. body symmetry

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  1. 5 November, 14:34
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    The answer is C. This was achieved through gene regulatory networks. The ability of the cells to segment and differentiate gave the metazoans a great advantage. This is thought to have begun in the Cambrian period with complete bodies existing by the Paleozoic era.
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