Which of the following is a demonstration and not an experiment?

Question 2 options:

Microwaving seeds for 10, 20, and 60 second intervals and then measuring how much they grow over time

Using 6 potatoes to power a light bulb

Adding 5mL of vinegar to 10g of baking soda

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.