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

anonymous · Answer

Well think...Which of these happen internally rather than externally?

anonymous · Answer

Your answer is D @Kaz...

anonymous · Answer

Wasn't this question asked? I saw it earlier today. It's D.

anonymous · Answer

don't just say the answer...let them try and figure it out...

anonymous · Answer

or give them a clue..