Where can you find carbon? A. only in Earth's atmosphere
B. inside every living thing on Earth
C. inside the sun
D. inside all water molecules

B

Explanation:

Carbon connected with hydrogen is the building block of every living organism on earth. When you look at an organism or a organic substance, you will always find Carbon, If not hydrogen.

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D

Explanation:

On Earth, most carbon is stored in rocks and sediments, while the rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs, or sinks, through which carbon cycles.

i think the answer is composed of atoms