Answer:
They pick up oxygen from the lungs and drop off oxygen to the cells through the capillaries
I also believe the answer is A.
It is the basic unit of energy for all functions of the cell without ATP the ions wouldn't be able to transport across the cell membrane.
I hope this helps!
I would say B is the answer because Athlete's Foot is an infection, African Sleeping Sickness is caused by a parasitic disease, and tuberculosis is a disease.
Chemicals produced by bacteria that limit the growth of other bacteria are called antibiotics.