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16 March, 11:56

Animals in which the first opening of the embryo is the mouth are called

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  1. 16 March, 15:22
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    These animals wherein the first opening they develop in embryonic stage becomes the mouth are called protostomes, literally "primitive openings" as protostomes are more primitive than its counterpart deuterostomes wherein the first opening they develop in embryonic stage becomes the anus.
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