Question

The complicated molecules that make up living things usually contain carbon. Why is carbon so important in these molecules?

Answer 1

A
The strong, stable and high number of bonds that carbon can form make it an essential element in organic molecules. 

Answer 2

Answer;

A. Carbon can form four strong covalent bonds.

Explanation;

Carbon can form up to 4 covalent bonds, and it can form reasonably strong bonds with nitrogen, oxygen, and other heteroatoms.

Carbon also has an almost unique ability to catenate: to form long chains with

C − C linkages, and along the chain there can be regions of different reactivity (by the presence of functional groups).