What is the main goal of gene therapy? to cure human diseases
to produce inexpensive medicine
to lower the costs of livestock production
to increase the nutritional value in foods

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

What would happen to a volleyball left outside in the winter? o o o o a. it would expand. b. it would lose air. c. it would shrink. d. it would explode.

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element