Question

Explain body layers as the criteria
for classification of animals​

Answer 1

Answer:

Criteria for animal classification are:

Symmetry: Animals are radially symmetrical, bilaterally symmetrical or asymmetrical.

Segmentation: Animals may or may not have segmented body.

Appendages: Animals may have organs or parts attached to the trunk or outer body wall.

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Answer 2

Answer:

If an organism has two germ layers, the ectoderm and the endoderm it is said to be diploblastic. If they have three germ layers, the ectoderm, the mesoderm and the endoderm they are triploblastic animals. ... Animals like the roundworm have a body cavity but it is located between the endoderm and the mesoderm.