Pick your answer from:
a). single-celled organisms
b). important habitats
c). abandon habitats
d). stop reproducing
e). animals with backbones
f). produce offspring
g). population movement
h). destroy offspring

Fact 1: If all members of a species cannot produce offspring then that species will likely become extinct. Fact 2: Avian species are less likely to become extinct if they are common across large ranges. Given the two facts above, avian species are less likely to end up extinct if they what?
Answer:
f).