Which of the following characteristics of the fetus distingu

Which of the following characteristics of the fetus distinguishes it from the embryo? Select one:

a. Blood cells form and fill primitive blood vessels.

b. The primitive streak appears.

c. Bone replaces the softer cartilage.

d. The specialization of one group of cells causes adjacent groups of cells to specialize.

Solution

D. The specialization of one group of cells causes adjacent groups of cells to specialize.

this is called differentiation of cells