What is the correct definition of a compound? substance composed of identical molecules consisting of atoms of 2 or more
chemical elements.
material composed of 2 or more substances which retain their own characteristics.
homogeneous mixture of 2 or more substances that
do not retain.

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.

a:

by the combination of an unlimited number of elements