Answer:
The stimuli is photoreceptor
Explanation:
The fish has been conditioned to react to light so it has conditioned response
Epithelium is the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.
I believe that the government should have limited access to people's genetic codes as they might be useful in solving crime or figuring out someone's identity and relatives
The storage + the transmission of genetic info are NOT done by proteins but by your DNA.
A would be your answer.