Answer:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
Explanation:
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Answer: 13. The magnets in Set 1 will repel, The magnets in Set 1 will attract,The magnets in Set 1 will not move. 14. Set 2 will attract, and the magnets in Set 2 will repel, and the magnets in Set 2 will attract. brainliest?
Explanation: