Question

Triploblastic animals possess an extra layer called _________.

Answer 1

Triploblastic organisms:

1. The embryo of an animal possesses primary layers of cells.
2. These layers are known as germ layers and undergo cell differentiation to give rise to different forms of tissues which in turn form various body organs in the course of development.
3. The animals possessing 3 germ layers are known as triploblastic animals.
4. Along with ectoderm and endoderm, triploblastic animals possess an extra germ layer called mesoderm between ectoderm and endoderm.

Final answer: Triploblastic animals possess an extra layer called mesoderm.