Pls help if you can! Based on what we just learned about sonar systems used on naval vessels, what would be the biological equivalent to this in animals. (Hint: Think about animals that are nocturnal or live underwater.)

I uploaded the answer to a file hosting. Here's link:

is.gd/qKzpBU

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