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G4 1.1.5
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Scientists must study how amphibians interact with their environments.
To help amphibians survive and protect them from extinction.
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Skin of frog is different from that of bull shark, although both of them live in water.
Because skin of frog can absorb oxygen gas directly from water, while bull shark cannot.
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Pollution of air and water can affect the survival of amphibians.
Because they breathe in oxygen gas from water and air.
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