A. Crossing it required bodily changes
B. The land once rose much higher above the sea
C. Every attempt to cross it ended in death
D. Once they crossed, there was no return Reptiles and mammals Amphibians
C
Dựa vào đoạn “Millions of years after the first clumsy amphibians crawled over the land, newer types of land dwellers appeared, these animals give rise to the present-day reptiles and mammals. They were completely converted for land dwelling, with bodies and biological activities far different from those of fish.”
Đáp án C
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