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Protostomes that have bilateral symmetry and three embryonic germ layers, but that do not possess a coelom or pseudocoelom, are called

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Flatworms are free-living or parasitic animals, with bilateral symmetry, triblastic and with no coelom. The correct answer is FLATWORMS.

What are the flatworms?

These are animals of variable size, going from a few millimeters to centimeters.

Flatworms are bilateral, acoelomated, and triblastic animals. The fact of being acoelomate means that they lack an internal cavity. Their whole body is solid, having mesenchyme where different organs are located.

Sense organs are located in the anterior part of the body.

These animals are hermaphrodites, exhibiting cross reproduction and eventually autofecundation.

They might be free-living animals or parasitic.

You can learn more about flatworms at

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