The answer is c because...
Natural science can be broken into two main branches: life science (or biological science) and physical science. Physical science is further broken down into branches, including physics, astronomy, chemistry, and Earth science. All of these branches of natural science are divided into many further specialized branches (also known as fields), and each of these is known as a "natural science".
Hope this helped!
Answer:
Protein, polypeptide chain
Explanation:
If you are just starting to learn biology then the answer is probably proteins!
