after the sperm enters the egg the egg undergoes certain changes in its outer layers preventing any more sperm from entering
No it can not.
Ovum has a layer of zona pellucida around itself. When a sperm enters the ovum, the cortical granules present in the ovum, causes the thickening of the zona pellucida. This prevents the entry of other sperms in the ovum and only one sperm is able to fertilize the egg.
The luckiest of all sperms makes it alive and fuses with the ovum.
The ovum is bound by many membranes preventing the breakage of it. The ovum contains food which is essential for the developing zygote. It forms a fertilization membrane after fertilization to prevent the entry of the other sperms.
On average Femaled discharge one ovum.
it is produced by sperms to help penetrate the ovum and fertilize it
as soon as a single sperm fertilises the ovum a change of composition takes place in ovum's outer layer forming zona pellucida which prevents the penetration of other sperms.
Average is 111 million. Most never reach the egg.
There are few prerequisite for the pregnancy to take place. You should be a female. You should belong to the age group of menarche to menopause. Then you need to have sexual contact with the fertile male. At times the semen is accidentally or artificially put into the vagina and you become pregnant. The sperms travel to the fallopian tube to meet the ovum. many sperms try to penetrate the ovum. One gets in to fertilize the ovum. This fertilized ovum embed itself into the uterine wall to give you pregnancy.
as soon as a single sperm fertilises the ovum a change of composition takes place in ovum's outer layer forming zona pellucida which prevents the penetration of other sperms.
when one sperm penetrates the membrane of an ovum. it will tickens and secrete an enzyms that digest other sperms
Then the male can transfer sperms to your body through ejaculation. And one of these sperms will meet an ovum in your body, fertilize it and become a baby.