A developmental psychologist conducts an experiment to determine if exposure to an enriched environment shortly after birth will cause increased brain development. Twenty, two month old rats are randomly selected from a pool of one thousand, two month old, rat pups. Ten of the twenty pups are exposed to an enriched environment for three weeks and the other ten to the usual environment for the same period of time. At a suitable time after the exposure, the psychologist measures the number of neurons per cm3 in the brain of each rat. A comparison is then made of the mean number of neurons per cm3 for each group. Identify the following: 
Definitions:
Karl Marx
A 19th-century philosopher, economist, and revolutionary socialist who developed the theory of Marxism, critiquing the impacts of capitalism on society.
Capitalists
Individuals or entities that own capital goods, invest in business ventures, and seek to generate profits within an economic system based on capitalism.
19th Century
Refers to the 1800s, a period marked by industrialization, political changes, and significant technological advancements.
18th Century
The period from 1701 to 1800, recognized in history for significant social, political, and industrial changes worldwide.
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