Question

from which primary germ layer does the nervous system and epidermis of the skin develop?
a ectoderm
b endoderm
c mesoderm
d none apply.

Explanation:

The ectoderm is one of the three primary germ layers in the early embryo. It gives rise to the nervous system (including the brain and spinal cord) and the epidermis (the outer layer of the skin). The endoderm forms the lining of the digestive tract and respiratory system. The mesoderm develops into muscles, bones, and the circulatory system.

Answer:

A. Ectoderm