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Mammals lead more active lives than reptiles because mammals have body hair and more efficient hearts and _____.
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Mammals lead more active lives than reptiles because mammals have body hair and more efficient hearts and _____.

User Simeon
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My answer is: Mammals lead more active lives than reptiles because mammals have body hair and more efficient hearts and lungs.

hope this helps!


User Mike Petrichenko
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6.4k points
4 votes
The answer is "lungs" 
User Mibrahimy
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6.3k points
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