The earthworm is an example of a coelomate.Which term does not apply to this animal?

Question

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Earthworms are triploblastic and exhibit spiral cleavage during embryonic development. They also have a segmented body and a peritoneum, which is a layer of tissue that lines the body cavity. However, they are not monoblastic, which refers to animals that develop from a single germ layer. Earthworms, like all coelomates, have three germ layers (ectoderm, mesoderm, and endoderm) that give rise to their various tissues and organs.

The Earthworm Is an Example of a Coelomate