How could several rocks, each formed in a different place, all end up in your back yard?

its the cell wall and the they are unique to plant

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

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