Approximately how many animals are used each year in biomedical research projects?

• A. More than 20 million
• B. About 100 thousand
• C. About 1 million
• D. About 10 billion

Answer: (A)

The main idea here is the scale of how many animals are used in biomedical research each year. Globally, the number falls in the tens of millions. Estimates commonly cited place the total at more than twenty million animals annually when you include research, testing, and education across many countries. This makes the figure clearly larger than hundreds of thousands or a million, yet not anywhere near billions. Keep in mind that exact counts vary depending on how counting is done (animals used vs. procedures performed) and what activities are included, but the widely cited range puts the annual total above twenty million.