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 normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins