The molecules made by living cells are mainly assembled around which element? A. calcium
B. carbon
C. hydrogen
D. oxygen

Carbon atoms B.

Explanation:

The atoms of an organic molecule are typically organized around chains of carbon atoms. Inorganic compounds make up 1%–1.5% of a living cell's mass. They are small, simple compounds that play important roles in the cell, although they do not form cell structures

a and c are the answeres