Question

all organisms contain and require it to survive. helium carbon zinc polonium

Explanation:

Carbon is a key - element in organic compounds which are fundamental to life. All living organisms are composed of organic molecules that contain carbon. Helium is a noble gas and not a major component of living things. Zinc is a trace element in organisms but not as fundamental as carbon. Polonium is a radioactive element and not a necessary element for the survival of organisms.

Answer:

carbon