How does a buffer regulate ph? a. it changes ka and kb of added acids and bases. b. it prevents added acids or bases from reacting. c. it removes added h+ or oh– from the solution. d. it lowers the activation energy of the reaction.?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)