Causes light rays passing through it to meet at a focal point a. convex lens b. concave lens or c. both?

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.

The grooves or folds of the brain are called

The biosphere of the earth is made up of what compound? organic or inorganic?