The answer is
1) Valves between atria and ventricles close, 2) first heart sound heard, 3) valves between ventricles and body close, 4) second heart sound heard
I want to say C. Aardvark, whale, hyena, dog, dolphin, and mole.
All of these mammals eat primarily meat.
B. is a close second, but the human and rat are both omnivores and don't regularly rely on meat for most of their dietary needs.
Explanation:
It's considered a natural resource because it is energy that is not man made.
It's a renewable energy because it naturally gets replaced.