Which describes a stationary reference point? A. A slower moving truck from the point of view of a car passing it
B. A plan from the point of view a falling sky driver
C. A tree from the point of view of someone in a moving car
D. The sun from the point of view of someone sitting outside

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.