Biochemistry is the study of __ chemical reactions and bonds energy and matter within living organisms energy and matter of earth energy and chemicals

## Step 1<br />Biochemistry is a branch of science that combines biology and chemistry. It focuses on the chemical processes that occur within living organisms. This includes the study of the structure, function, and interactions of biological macromolecules, such as proteins, nucleic acids, lipids, and carbohydrates.<br /><br />## Step 2<br />The options provided in the question are:<br />1. Chemical reactions and bonds<br />2. Energy and matter within living organisms<br />3. Energy and matter of earth<br />4. Energy and chemicals<br /><br />## Step 3<br />The first option, "chemical reactions and bonds," is too broad and does not specifically relate to living organisms. The third option, "energy and matter of earth," is more related to geology or earth science. The fourth option, "energy and chemicals," is also too broad and does not specifically relate to living organisms.<br /><br />## Step 4<br />The second option, "energy and matter within living organisms describes of biochemistry. It emphasizes the study of energy and matter in the context of living organisms, which is the core of biochemistry.