I think is A or D
............................. a
A protein is a polymer of amino acids. When amino acids are joined by dehydration synthesis (a process that removes water to form a chemical bond), they form peptide bonds. There are three main components of an amino acid, the amino group, the side chain, and the carboxylic acid group.
Answer and Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
At the end of the esophagus is a thick ring of a muscle called a sphincter which allows food to enter the stomach but not from the stomach back into the esophagus. Once the food enters the stomach it is mixed with the digestive juices.
Answer: This material will interact when the galaxies collide. ... There is also friction between the gas in the colliding galaxies, causing shock waves that can trigger some star formation in the galaxies. These processes can radically affect the galaxies. For example, two spiral galaxies can merge to form an elliptical galaxy.
