Which layers form Earth’s rigid, mobile tectonic plates? crust and uppermost mantle

inner and outer core

crust and lower mantle

upper and lower mantle

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