HELP ME PLEASE UREGENT

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

This drawing shows a human body system. what is the primary function of this body system?