Which of the following lists stars in order of increasing size?
a.
giants, superdwarfs, dwarfs
b.
dwarfs, giants, supergiants
c.
giants, supergiants, dwarfs
d.
superdwarfs, dwarfs, giants

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.