Question

select the correct answer. which substance is a source of hydrocarbons? a. natural gas b. protein c. silk d. starch e. water

Explanation:

Hydrocarbons are compounds made of hydrogen and carbon. Natural gas mainly consists of methane ($CH_4$) and other hydrocarbons. Protein is made of amino acids (containing C, H, O, N, etc.). Silk is a protein - based fiber. Starch is a carbohydrate (composed of C, H, O). Water is $H_2O$ (no carbon - hydrogen - only structure). So natural gas is a source of hydrocarbons.

Answer:

A. natural gas