Amental grouping of similar objects, events, ideas, or people is a(n):

For the answer to the question above. I believe the answer is "CONCEPT". for Concepts are fundamental building blocks of our thoughts and beliefs. It plays an important role in cognition process.

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The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.