Answer:
Fertilization or fusion of gametes
Explanation:
Fertilization is a process in which male gamete (sperm) from male parent fuses with the female gamete (egg) from female parent.
Fertilization results into a diploid zygote which is the first cell of the new organism.
The zygote soon divides by the repetitive mitotic division to form multiple cells. The multiple cells undergo several changes to develops into embryo.
