Yes, in the very beginning of your life everyone was a female. However within the first few weeks the sex is determined and then the males become males.
Female African elephants can typically begin having babies between 10-12 years of age.
Not necessarily
Nope
None.
all of the female dinosaurs , they are oviparous
Most can if they are old enough
That's false. Monotremes lay eggs, from which the babies hatch.
Penguins - like all birds - don't have babies, they lay eggs.
No, not all, only those that are female, have mated and become pregnant.
Yes, all you will need is male rabbit
Yes you have to separate the male gerbil from the female with her babies because if you leave the male with the female and her babies the male will kill them.
well female leeches do have babies they have about 500,000 per hour