the cockroach egg take about 19,20 or 21 days.
Around a cockroach egg.
The stages of developement in a cockroach are: Egg - nymph - adult cockroach
3-8 months.
Don't be silly
The tail of a sperm remains with the head until the sperm goes into the egg to fertilise it.
If they hide there, they lay the egg there too.
Oothca.
yes
Because the sperm will die if it doesn't fertilise the egg. Survival at its basics.
Ones is flatter.
sperm
Because it is a mamal