Questions: Mark Rosenzweig et al. (1962) raised some young rats in solitary confinement, and others in a communal playground that simulated a natural environment. After 60 days in the enriched environment, the rats' brain weights increased by as much as percent and the number of brain synapse connections increased by about percent. 10 ; 20 10 ; 15 5 ; 20 5 ; 10

Mark Rosenzweig et al. (1962) raised some young rats in solitary confinement, and others in a communal playground that simulated a natural environment. After 60 days in the enriched environment, the rats' brain weights increased by as much as percent and the number of brain synapse connections increased by about percent.
10 ; 20
10 ; 15
5 ; 20
5 ; 10

Transcript text: Mark Rosenzweig et al. (1962) raised some young rats in solitary confinement, and others in a communal playground that simulated a natural environment. After 60 days in the enriched environment, the rats' brain weights increased by as much as $\qquad$ percent and the number of brain synapse connections increased by about $\qquad$ percent. $10 ; 20$ $10 ; 15$ $5 ; 20$ $5 ; 10$

Solution

The answer is the first one: 10; 20.

Explanation for each option:

10; 20: This option is correct. The study by Mark Rosenzweig and his colleagues found that rats raised in an enriched environment showed an increase in brain weight by about 10% and an increase in the number of synapse connections by about 20%.
10; 15: This option is incorrect because it underestimates the increase in synapse connections, which was about 20%, not 15%.
5; 20: This option is incorrect because it underestimates the increase in brain weight, which was about 10%, not 5%.
5; 10: This option is incorrect because it underestimates both the increase in brain weight and the increase in synapse connections. The correct increases are about 10% and 20%, respectively.

In summary, the correct answer is 10% increase in brain weight and 20% increase in synapse connections for rats raised in an enriched environment.

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