Answer:
The Cardiovascular System
Explanation:
The respiratory system draws air into the lungs. Oxygen diffuses through the walls of the alveoli and across the walls of the capillaries where it enteres the bloodstream. The oxygen molecules are picked up by red blood cells, which are pumped through the blood vessels by the action of the heart. As the red blood cells carrying oxygen pass through capillaries near the cells, oxygen diffuses into the cells.
Using statistics.
Make a tree diagram - probability adds up to 1
Scientists and biologists study the world using experimentation. This can be done through observation, or by performing scientific tests in a lab.
ether patatos or bread is my best guess
I hope this helped
