Describe the distinguishing class features of the people who were known as "planters," "plain folk," "hill people," or "crackers."

Planters were the dominated class owning more slaves, usually more than 20 for a basic idea. Plain folks were the second in rank and had a few slaves but not as much as the planter, these people were closer to the planters. Hill-people refer to those who had no slaves at all; these folks did not like planters and usually went against them. And lastly the crackers were the lowest of all, who did not even had anything to eat, reportedly having clay as their nutrition needs hence lining them even under the rank of a slave.

radiant energy is a form of kinetic energy only.(a)

the answer to your question is,

old stone age.

-mabel < 3