Cells in the human eye send nerve impulses to the brain that cause the pupil to constrict. this is an example of a reaction to what kind of internal stimuli? a. chemicals b. light c. touch d. sound

B. light
the pupil will constrict in response to brighter light been shined in the eye

Hey there 

the answer is (B) Light (Electromagnetic energy/Light waves)

Hopes this Helps u 

p.s Drugs are another thing that can cause the pupil to constrict 

Where is the rest of the question

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.