13. Explain why some mutations are more harmful than others.

hard .

Explanation:

Because having 3 eyes or 6 does isnt harmful but having 3 arms or legs you could get seriously hurt or lose the limb and bleed out.

Explanation:

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