OPTIONS:
a). no natural habitat.
b). no natural prey.
c). competing for resources.
d). peachleaf willow.
e). no natural owners.
f). members of their own species.
g). animals with backbones.
h). no natural predators.
Q: Fact 1: Having no natural predators increases population size. Fact 2: Any population has the potential to produce more offspring than the environment can support. Given the two facts above, having what increases the potential to produce more offspring than the environment can support?
A:
h).