A species would be extinct if they can't produce their descendants during every generation.
A species would be extinct if they can't produce their descendants during every generation.
一个动物物种如果不能在每一代生育足够数量的后代,那它就要灭绝.
A species would be extinct if they can't produce their descendants during every generation.
一个动物物种如果不能在每一代生育足够数量的后代,那它就要灭绝.