Which Element is Not Found in All Living Systems

Question

Which element is not found in all living systems?
A) Nitrogen
B) Phosphorus
C) Sulfur
D) Carbon
E) Helium

Accepted Answer

Helium is an inert gas and is not essential for the biochemical processes of living systems. The other elements listed (nitrogen, phosphorus, sulfur, and carbon) are all found in living organisms and play important roles in biological systems.