Which statement best describes the share of rodents used in biomedical research?

Which statement best describes the share of rodents used in biomedical research?

• A. The vast majority, around 90-95 percent
• B. A minority
• C. Exactly half
• D. None

Answer: (A)

The share of rodents used in biomedical research is overwhelmingly large. Mice and rats constitute roughly 90–95% of laboratory animals, so describing their share as the vast majority reflects the real distribution you’ll see in most research settings. This dominance comes from practical advantages: small size, short generation times, lower costs, and a long history of developed strains and genetic tools that make it easier to design and repeat experiments. Because of these benefits, researchers frequently start with rodents as the default model for studying biology, disease, and new therapies. The other options don’t fit the actual pattern, since a minority, exactly half, or none would not align with the widespread use of rodents in biomedical studies.

The share of rodents used in biomedical research is overwhelmingly large. Mice and rats constitute roughly 90–95% of laboratory animals, so describing their share as the vast majority reflects the real distribution you’ll see in most research settings. This dominance comes from practical advantages: small size, short generation times, lower costs, and a long history of developed strains and genetic tools that make it easier to design and repeat experiments. Because of these benefits, researchers frequently start with rodents as the default model for studying biology, disease, and new therapies. The other options don’t fit the actual pattern, since a minority, exactly half, or none would not align with the widespread use of rodents in biomedical studies.