The diagram shows the movement of food through the digestive organs. Which factor best explains why materials are able to move in the directions shown? *
(2 points)
1.Gravitational pull
2.Controlled movement by the muscular system called peristalsis.
3.Skeletal support

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.