Which is an example of an internal stimulus?

A.
a sudden change of air temperature

B.
an artificial light that attracts insects

C.
an increase in the amount of water available to a plant

D.
a decrease in oxygen levels in the blood during exercise

Question

Which is an example of an internal stimulus? 	
	
 
A.
	a sudden change of air temperature
	
 
B.
	an artificial light that attracts insects
	
 
C.
	an increase in the amount of water available to a plant
	
 
D.
	a decrease in oxygen levels in the blood during exercise

charlotte123 · Answer

A decrease in oxygen levels in the blood during exercise - http://www.ask.com/question/internal-stimulus