The first triploblastic animals _________

have osmoregulatory structures

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exhibit direct development

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have mesodermal pouches

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show flattened body anteroposteriorly

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Solution

The correct option is A have osmoregulatory structures
Platyhelminthes are first triploblastic animals and they have flame cells that help in excretion and osmoregulation. These are hollow cells terminating the branches of the excretory tubules of certain invertebrates, including flatworms and rotifers.

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