A Frog Can Absorb Oxygen Through Its Skin and Lungs

Multiple Choice

A frog can absorb oxygen through its skin and lungs.Which of the following is an advantage of absorbing oxygen through the lungs?

A) The heart pumps oxygen from the lungs into the bloodstream
B) Oxygen absorbed in the lungs enters the blood stream
C) Air in the lungs has a higher concentration of oxygen than air in the atmosphere
D) Oxygen diffuses across cells more slowly than across the lining of the lungs
E) Lungs have more surface area than the skin