2. the action of abrasion can best be described as
a. windblown sand cutting and polishing exposed rock surfaces
b. coarse sand particles rolling along the desert surface
c. sand being blown high into the air to cut and carve rock formations
d. the wind creating desert pavement

answer; i believe the correct answer is (replication is not conservative);

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