The tendency of water molecules to stick together is referred to as

cohesion

Explanation:

Essentially, cohesion and adhesion are the "stickiness" that water molecules have for each other and for other substances. You can see this in the picture of pine needles. The water drop is composed of water molecules that like to stick together, an example of the property of cohesion.

b.transmitters send radio waves, and receivers capture radio waves.

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