The time period from conception to birth is called it is further divided into three periods called . how many sperm cells can fertilize an egg? the fusing of an egg and sperm forms a

First question- This period is called gestational period
Second question- it is further divided into
* First trimester (week 1-12)
* Second trimester(week 13-27)
* Third trimester(week 28-40)

Third question- Although millions of sperm cells are ejaculated, only one cell ferterlizes the egg

Fourth question- Sperm and egg fuse to form a diploid cell called a zygote.