2. choose D. plants have no nervous system and can only respond slowly to external stimuli. There is a candidate B on it, which is actually correct. The animal is heterotrophs, and the energy and nutrition needed for survival are obtained from food. Of course, the metabolism in the body can transform different nutrients, but in the final analysis, the nutrition and energy of animals come from food, and only plants can feed themselves.

3. Selection B. Amphibia is the first species to transition from fish to land in biological evolution. Its physiological structure and life cycle have the characteristics of both terrestrial and aquatic organisms, and it can't survive without water at all. Amphibians evolved into reptiles to really get rid of the water environment, so they chose reptiles.

4. Choose B. Birds and mammals can live on land all their lives and are real terrestrial vertebrates. Insects are arthropods, not mammals. C. Amphibians can't live completely out of the water environment, so no, reptiles are D.

Trust me, make sure it's correct.