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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Human Activities and Loss of Habitat.
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The answer would NOT be B for this question.
Knowing myself the answer would be A because nuclear energy would be an alternate source of energy unlike natural gas.
