awnser is A growth, repair.
The circulatory system is very useful. This system transports the food nutrients, and oxygen to the body cells. It also delivers of carbon dioxide and waste products. This helps the respiratory system by transporting nutrients to keep the lungs clean, and healthy.
That would be cardio work
Answer:
The mean population is computed by adding the population for the beginning of each of the twelve months and for the end of the last month, and dividing the sum by 13.