Answer: choice c
Explanation: choice a and choice c are very similar, but the phrasing of the words is different. Genes are made up of DNA.
Pepsin is an Enzyme that is found in the stomach to break down protein.The Pepsin breaks the protein down into smaller peptides at low pH vale.
There is also one within the small intestine called Chymotrypsin and also the Carboxypeptidase.
Hope this helps and if you are still unsure read up on these to help you.
Each human has 20 sets of joints, cartilage, ligaments, and bursae.
C. They unwinds the two strand of DNA.
