The appropriate choices are A and B: Body cells and high animal protein diet Compared to bird lungs, human lungs are far less efficient at capturing oxygen from the air.
This is essential for birds because they need more oxygen to absorb the energy from the food they eat because they burn a lot of energy while they fly. Additionally, there are times when birds fly very high in the sky, where there is less oxygen. Health professionals hypothesize that protein from animal sources adds to an increased risk of heart disease since people who consume diets heavy in animal protein often experience more heart attacks than people who obtain their protein largely from plant sources.
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