Which substance is considered a building block for all living things?
hydrogen
Glucose
carbon
protein

Protein is a substance which is considered a building block for all living things.

Explanation:

The body of all the organisms are made up of protein. Protein is made up of small units called amino acids. There are some food which contains protein. When the organisms eat these types of foods, the body consumes that protein and change into amino acid and build the muscles of the organisms.

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