CHEMICAL energy that cells use to produce atp
Answer: Option D) there are no holes for blood to enter or leave the system
The human cardiovascular system is considered closed because there are no holes for blood to enter or leave the system
Explanation:
The closed circulatory system are made up of blood vessels called arteries from the heart that branch into small units called capillaries but eventually join up with other blood vessels called veins that are connected to the heart. So, blood is always confined to circulate within the blood vessels and the heart as there are no holes for blood to enter or leave the system
Thus, the human cardiovascular system is considered closed
A peptide linkage forms between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule releasing a molecule of water
Amino acids join together by dehydration synthesis to form a peptide bond. These peptide bonds join together to form a polypeptide chain. Then, the polypeptide chain twists into a 3D shape to become a protein. I hope that this is the answer that you were looking for and it has helped you.
Answer:
carbon dioxide , water, NADH makes molecules of sugar during Calvin cycle...
