An organic chemist, a scientist who studies organic molecules, would be interested in what type(s) of molecules

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).

it's c. (to reduce the greenhouse effect/carbon gasses)

the scientific method.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.