All of the following are characteristics of exchange systems except: select one: a. they pay special attention to calories. b. they give a sense of which foods are similar to each other. c. they sort foods by their carbohydrate contents only. d. they highlight the fact that most foods provide more than just one energy nutrient.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.