Question

some bugs can walk on the surface of water because the attraction between water molecules is strong enough to hold up the bug. what do we call this attraction? adhesion/cohesion.

Explanation:

Cohesion is the attraction between molecules of the same substance. In this case, it's the attraction between water molecules. Adhesion is the attraction between molecules of different substances. Since the question is about the attraction between water molecules (same substance), it's cohesion.

Answer:

cohesion