You mean, how do they reproduce? They mate. And they don't lay eggs, they're livebearers.
A male guppy will fertilise any female guppy it is in with. Mother,sister, no relation, whatever. It doesn't know and it doesn't care. That is nature.
no
No.
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.
No, a guppy is a livebearing fish, and a goldfish is egg laying.
sperm
Because it is a mamal
a sperm call job is to find an egg to fertilise
Yes they are. They are needed to fertilise the egg.
the sperm cells have to swim to the ovum and then fertilise it. and the egg cells have to reproduvce the offspring