Answer:
the answer is A
Explanation:
i took this test and i got 100% on it so trust me
The digestive system. The digestive system breaks down food to provide the body with energy.
Classical biotechnology dates back about 100, 000 years ago.
Answer:
Because heat is lost from the surface of the body, small mammals lose a greater proportion of their body heat than large mammals. Mammals conserve body heat with their hair or fur. It traps a layer of warm air next to the skin. ... Mammals also have a layer of fat under the skin to help insulate the body.