Final answer:
The zygote divides by cleavage to become an embryo, which continues to divide to form a human fetus.
Step-by-step explanation:
The zygote divides by cleavage to become an embryo, which continues to divide to form a human fetus. Cleavage is a rapid process of cell division that results in the formation of a hollow ball of cells called a blastula or blastocyst. This early stage of development is crucial for the subsequent growth and differentiation of cells in the human body.