All of the following human activities reflect frontier-ethic thinking except . draining wetlands

preserving rain forests

building dams

clear-cutting forests

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

helicase, i think thats it