The answer is c. they have a full outer energy level of 4 valence electrons
Answer: A. To break down food into nutrients that can be circulated around the body. :)
Renewable Resources - a source that be used repeatedly and does not run out because it is naturally replaced. Endless supply.
(example: Wind Energy and Solar energy)
No renewable Resources - A Natural source that can not be readily replaced in natural ways nor can it be replaced quick enough to keep up with how much it is used.
(example: Fossil Fuel)
Hope this helps :)