It usually happens to girls from the age of 10-16. Girls usually grow small breasts and pubic hair before their period begins. After that, they can get pregnant when having sex.
mating must happen randomly
For a new moon to occur the moon must be between earth and the sun
lalalaljsk
mating must happen randomly
mating must happen randomly
A population must be isolated in some way
mating must happen randomly
mating must happen randomly
mating must happen randomly
The temperature must be hot to do so.
a reveiw of what is known about the subject must occur
two molecules must collied before diffusion happens.