What percentage of the animals used are rodents?

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Multiple Choice

What percentage of the animals used are rodents?

Explanation:
Rodent species dominate laboratory animal use; mice and rats are the standard models because they’re small, inexpensive to keep, breed quickly, and have extensive genetic tools. This combination makes them represent the largest share of animals used in biomedical research, commonly around nine out of ten. So 90 percent reflects this dominance. The other options would imply a much smaller or more evenly split usage pattern than what is typically observed in standard datasets.

Rodent species dominate laboratory animal use; mice and rats are the standard models because they’re small, inexpensive to keep, breed quickly, and have extensive genetic tools. This combination makes them represent the largest share of animals used in biomedical research, commonly around nine out of ten. So 90 percent reflects this dominance. The other options would imply a much smaller or more evenly split usage pattern than what is typically observed in standard datasets.

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