Question

from which layer of cells does the hair and the nervous system develop during the embryonic period?
a. endoderm
b. ectoderm
c placenta
d. mesoderm

Explanation:

During embryonic development, the ectoderm gives rise to the hair and the nervous system. The endoderm forms internal linings, the placenta is for fetal - maternal exchange, and the mesoderm forms connective tissues and muscles, etc.

Answer:

B. ectoderm