Once fertilization has occurred, the activities of development begin. The first such activity is .
A) cellular specialization
B) the formation of organ systems
C) an increase in cell number

Question

Quizplus · Accepted Answer

The first activity following fertilization is an increase in cell number, a process known as cleavage. This involves a series of rapid cell divisions without growth, leading to the formation of a multicellular embryo.

Once Fertilization Has Occurred, the Activities of Development Begin