Which of the following is an example of a force that acts at a distance? a. a bear walking through the woods b. a jet ski skimming across the water c. a leaf falling off of a tree to the ground d. a tennis ball hit by a tennis player’s racket

D

Explanation:

Forces can be divided into those that act by direct contact—such as when you push on a door to open it—and those that act at a distance, where there is no apparent physical contact between the objects. Magnetism, and electrical charge, and gravitation are examples of forces that act at a distance.

it's c. elements are placed in rows based on how may valencies electrons have.