What molecule do scientists look for when they are investigating the possibility of life on other planets?

Question

What molecule do scientists look for when they are investigating the possibility of life on other planets?

A. Hydrogen

B. Carbon dioxide

C. Water

D. Oxygen

E. Sulfur

Much Appreciated! :D

Answer 1

that must be number 10. on the quiz

Answer 2

C. Water

EG. Evidence of water on Mars or not.

Answer 3

That would be water.