Fact 1: Mammals breathe with the help of a diaphragm. Fact 2: When the diaphragm moves down, air is pulled into the lungs. Given the two facts above, what breathes by pulling air into the lungs?

Choices:
[A]. humans;
[B]. animals;
[C]. bears;
[D]. sponges;
[E]. mammals;
[F]. bacteria;
[G]. goats;
[H]. oxygen;
Answer:
[E].