Animals found desert living possible only _____

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when they were fullyadapted to land

after they could walk on two feet

when they became amphibious

if theymigrated to sea periodically

Giải thích

Chọn đáp án A

Giải thích: Thông tin nằm ở: “They were completely converted for land dwelling, with bodies and biological activities far different from those of fish. With these special adaptations, mammals have been able to colonize the woods and meadows, the deserts ”