He has been very interested in doing research on since he was at high school. a. biology b. biological c. biologist d. biologically

option a is right.biology

biology

Explanation:

This is because research is made on a subject which should basically be a noun but since there's on article before the missing word therefore the noun biology suits best

judy jones is an attractive woman who receives attention from many men throughout the story.   despite her beautiful appearance, she is superficial and callous.   she is an aggressive woman who goes after any man she desires but she is not happy.   she is fickle and is never satisfied.   her beauty is only skin deep.   dexter breaks down because he knows his dreams are unattainable.   he believes that wealth and physical beauty are what will make him happy.   he soon realizes that she has lost her attractive looks.   it is not all what he had planned.

for example: in, he, a,from