Answer:
A.? i'm not 100% sure tho
Explanation:
I would go for 'c'. The reason being, is that it doesn't do much, and I am also assuming that offshore drilling will not affect underwater sources, which are linked to the ocean.
One of their ideas was cloning
Hope I helped! ( Smiles )
B-Kidneys
The kidneys act as filters that strain urea and excess salts from the bloodstream to release them in the urine.