Answer:
Explanation:
Cell differentiate into billions of cells from a single cell. At the time of fertilization, sperm and egg fuse to form a zygote. Zygote is a single cell from which all the cells of an organism originate. Whole cells of the body are generated from a single cell by the process, called cellular differentiation. Cell differentiate into different morphology and function due to differential gene expression, Due to the differential gene expression, different organs are generated.