Because it is a mamal
No. Only one sperm is needed to fertilise the egg
When she ovulates. If she does not know her doctor can help her calculate it or she can pee on ovulation sticks from the pharmacy.
Don't be silly
the cockroach egg take about 19,20 or 21 days.
Because the sperm will die if it doesn't fertilise the egg. Survival at its basics.
Only one sperm is required to fertilize an egg. One is both necessary and sufficient in order for an egg to be fertilized. But in order to be confident that one will make it, you need a certain minimum sperm count.
Only one sperm cell can fertilise each ovum. After that no more can get in.
sperm
a sperm call job is to find an egg to fertilise
Elephants are born one at a time. About one every one year.
Yes they are. They are needed to fertilise the egg.
The elephant is a mammal, and gives live birth after a period of gestation. The only egg is released by the female and is fertilised by the sperm from a male, all of which happens internally in the female.