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.
scientists can test differences of the area with pigmentation by observing which is lighter and which is darker however they use microscope to look the difference of the pigmentation over the cells.
Mitochondria is the main power house
Hope this helped :))
1.
a. deoxyribose sugar, phosphate, and nitrogen-containing base
b. deoxyribose sugar
c. cytosine
d. adenine, thymine, guanine. and cytosine
