Question

ectoderm is to endoderm as ____________. a. lateral is to identical b. bone is to muscle c. heterogenous is to homogenous d. outer is to inner

Explanation:

The ectoderm is the outer - most germ layer in embryonic development and the endoderm is the innermost germ layer. Similarly, "outer" and "inner" represent an outer - to - inner relationship.

Answer:

D. outer is to inner