Which statement about enzymes is true? they are large molecules that decrease the rate of reactions in the body. they are large molecules that increase the rate of biologically important reactions. they slow the rate of chemical reactions. they are permanently changed in the course of a reaction.

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction