Can someone help me with this ?

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

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.