An example of a reaction to a stimulus is A) a boy smelling a flower
B) eyes blinking due to smoke in the air
C) a person tapping on the shoulder of a friend
D) a loud clap of thunder following lightning

c.more precipitation,but only when emission levels.

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