Why might scientists decide to do a laboratory experiment instead of fieldwork?

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

its b. greenhouse gasses trap uv rays for heat so that the plants stay alive.

answerdendrites; blank(2) axons;