Astudent is studying the effects of several solutions on the prevention of the browning of apples. the student used solutions having different ph values and immersed three apple slices in equal volumes of each of the solutions. which of these is the independent variable in this investigation?

Four statements about the development of the atomic model are shown below. a: electrons have wavelike properties. b: atoms have small, negatively charged particles. c. the center of an atom is a small, dense nucleus. d: atoms are hard, indivisible spheres. which order of statements represents the historical development of the atomic model? c-d-a-b c-d-b-a d— в-а — с d-b-c-a