Obviously during ovulation when it's released
Puberty.
No. You need a rooster for that.
Puberty.
A sperm don't need 70 days to to be able to fertilize an egg. Sperms are being made all the time and they are always ready to fertilize. When you ejaculate they are ready. So yes.
A sperm fused with an egg
sperm and egg. the sperm FERTILIZES the egg.
To get to the egg the sperm has to first go through sexual intercourse and then the sperm travels in a liquid till it reaches the fallopian tube where the egg is to get into the egg the sperm uses its tail. (only a brief way)
The mechanics of sexual intercourse are the male thrusts his penis into the womens vagina and ejaculates sperm into her tubes. The tubes travel to the egg and the sperm fertilizes the egg making the fetus in many months. In 9 months the women will be ready to give birth
The size of egg is larger than sperm because the the sperm enters inside the egg and egg has to accommodate the sperm. And egg contains fats and nutrients in order to feed zygote in case of pregnancy.
The sperm enters the egg (conception) in the fallopian tube.
A sperm and an egg.
The joining of an egg and a spermatazoan (sperm) is called fertilization.