Which of the following best describes a feature that distinguishes animals from fungi?

animals have cell walls containing cellulose and proteins, while fungi have cell walls containing chitin.

animals are heterotrophs, while most fungi are chemoautotrophs.

animals reproduce sexually or asexually, while fungi reproduce by binary fission or budding.

animals digest their food inside their bodies, while fungi digest their food externally

The option which best describes a feature that distinguishes animals from fungi is that animals digest their food inside their bodies, while fungi digest their food externally. 
They excrete this food, whereas you cannot see the process of digestion in animals. 

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.