Compared with environmentally impoverished rats, those rats housed in enriched environments experienced a dramatic increase in the number of their

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Enriched environments have been shown to cause an increase in synaptic density in rats. Telomeres are protective caps on the ends of chromosomes that shorten with age and stress, and teratogens are substances that can cause birth defects. Schemas are cognitive frameworks for organizing information, but it is not relevant to the context of the passage.

Compared with Environmentally Impoverished Rats, Those Rats Housed in Enriched