The respiratory system brings air into the lungs supplying the blood with oxygen. Oxygen is carried throughout the body to the organs and keeps the heart pumping and when the blood circulates back to the lungs the process starts over again.
Answer:
Integumentary is least connected to the Digestive system
Answer:
The correct answers are A and D
Explanation:
Answer:
It's A. love :), also sorry that people answer when they don't actually know it, and there just trying to get points.
Explanation:
A)Demographic; because the census studies things such as births,death, and even disease which show changes in human population
