Practice!

Sample Problem

Match the following forms of respiration with the correct animal. Write the corresponding letter in the blank (eg: “A”).

(A)  Diffusion

(B)   Mucus

(C)   Trachea

(D)  Lungs

earthworms

humans

crab

birds

jellyfish

spider

Solution

The answers are as follows: B, D, C, D, A, C. Remember, cnidarians like jellyfish and hydra use (A) diffusion; earthworms are aided by (B) mucus; arthropods, which include crustaceans, insects, arachnids, use (C) trachea; and vertebrates, like humans and birds, use (D) lungs.