An example of an amphibian's incomplete adaptation to land life is

* Hướng dẫn giải

Giải thích: Dựa vào “As amphibians, they possessed limbs instead of fins and lungs instead of gills. But they never became completely free of the bonds that tied them to the water; even today many amphibians return to the water to lay their eggs.”

Đáp án  A