Question

Complete the following sentences by writing the correct words.
Immediately after implantation, the inner cell mass differentiates into an outer layer called _________ and an inner layer called _________.

• A. ectoderm
• B. endoderm

Answer 1

Implantation:

1. Implantation is the process by which a fertilized egg, or embryo, is fixed in the uterine lining.
2. The ectoderm is a germ layer (or tissue layer) that arises in an animal embryo during development and covers the embryo's exterior.
3. The endoderm is the embryo's deepest layer and gives rise to organs such as the lungs and pancreas.

Final answer: Immediately after implantation, the inner cell mass differentiates into an outer layer called ectoderm and an inner layer called endoderm.