Answer the following question given this paragraph: 

Carbon is one of the most common elements found in living organisms. Chains of carbon molecules form the backbones of many organic molecules, such as carbohydrates, proteins, and lipids. Carbon is constantly cycling between living organisms and the atmosphere ( Figure below ). The cycling of carbon occurs through the carbon cycle .


Q: Which common element is the most found in living organisms?

 Choices:

- hydrogen

- oxygen

- monoxide

- carbon

A:
carbon
