In the classroom demonstration shown above, a rubber ball is dropped from position 1. the ball bounces as shown.
a. what is the source of the potential energy in this experiment?
b. in which position does the ball have the least potential energy but the most kinetic energy?
c. does the ball have more potential energy in position 2 or 4? explain your answer.

the answer to your question is:

c. complementary base-pairing

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