You are presented with the quiz "what has a positive impact on an animal 's ability to be a carrier for life?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "staying warm has a positive impact on an animal 's survival" and "animals that survive develop an immunity, but are also carriers for life". So, what's the best answer to the question?

Select from:
A). four limbs
B). staying frosty
C). staying isolated
D). prolactin release
E). staying warm
F). staying mad
G). coded genes
H). organic molecules
The answer is:
E).