Answer: Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood.
Explanation: A protein called hemoglobin in the red blood cells then carries the oxygen around your body.
Answer: B
Explanation: All living things have one or more cells
With every other lever 10% of the energy with be transferred. In this case:
Primary Producers (500)
1) First- level consumer. (50)
2) Second-level consumer. (5)
3) Third- level consumer. (0.5)
Remember the formula is:
(Primary Producer) __units X 10%= __
In this case: 500 units X 10%= 50
capillaries is the answer
