The layer of the embryonic disk that eventually develops into the endocrine system is the:
a. endoderm
b. mesoderm
c. ectoderm

The correct option is : a. endoderm

Explanation:

The primary layer of cells formed during the embryonic development is known as the germ layer. It is composed of three layers- endoderm , mesoderm and ectoderm.

The endoderm is the innermost germ layer and this layer develops into the interior lining of the endocrine glands, such as the thyroid gland.

violet light has a shorter wavelength than blue light. violet light is scattered more than blue light. however, the human eye is less sensitive to violet than to blue. as a result, we perceive a blue sky instead of a violet sky.