The middle layer of the embryo that becomes connective tissue is the ____.

A) amnion
B) ectoderm
C) mesoderm
D) endoderm
E) yolk sac

Mesoderm

The middle layer of an embryo in early development, which gives rise to muscles, bones, and other connective tissues.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of skin and nervous system.

Endoderm

The innermost layer of cells or tissue of an embryo in early development, which gives rise to the linings of the digestive and respiratory systems.