Question

which is one of the six fundamental elements that are found in living organisms?
○ helium
○ sodium
○ oxygen
○ chlorine

Explanation:

The six fundamental elements found in living organisms are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Among the given options, oxygen is one of these six fundamental elements. Helium is a noble gas not fundamental for living organisms, sodium is a mineral element (not one of the six fundamental), and "chlorine" (assuming a typo for chlorine) is also not one of the six fundamental elements for living organisms.

Answer:

C. oxygen