Question

the branch of science that studies carbon and its compounds is called select choice physical chemistry inorganic chemistry biochemistry organic chemistry

Explanation:

The question asks for the branch of science studying carbon and its compounds. Organic chemistry is defined as the study of carbon-containing compounds (except simple carbon oxides, carbides, etc.), which matches the description. Physical chemistry focuses on energy changes in reactions, inorganic chemistry on non-carbon compounds, and biochemistry on chemical processes in living organisms—none of these fit the definition here.

Answer:

organic chemistry