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17 July, 12:27

True or False. Animals vary tremendously in structure. Nevertheless, they can be categorized into a few basic body plans based on body symmetry, number of embryonic germ layers, type (or absence) of body cavity, and characteristics of embryonic development.

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  1. 17 July, 12:53
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    True

    Explanation:

    Animals can be categorized into 3 based on body symmetry

    Those without any body symmetry (asymmetrical) Those with bilateral body symmetry (bilateria) Those with radial body symmetry (Radiata)

    Animals can be categorized into 2 based on number of embryonic germ layer;

    Those with two layers - endoderm and ectoderm (diplobastic) Those with three layers - mesoderm in addition to ectoderm and endoderm (triploblastic)

    Animals can be categorized based on presence/absence of body cavity or coelom;

    No body cavity - acoelomates False body cavity - pseudocoelomates True body cavity - coelomates

    Animals can be categorized into 2 based on characteristics of embryonic development;

    Deuterostomes Protosomes
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