我们在生物学中学习繁殖。

We are learning about ___reproduction in biology.

如果我们寿命更长但不减缓我们物种的繁殖会发生什么？

What will happen if we live longer but we don't slow down the ___reproduction of our species?

濒危物种的繁殖是保护主义者的重点。

The ___reproduction of endangered species is a key focus for conservationists.