What is a requirement for accurate measurements of the rate of respiration using a respirometer?

A. CO₂ must be absorbed by water so that only O₂ production is measured.

B. Temperature must be kept constant so the volume changes are only due to O₂ use.

C. Anaerobic organisms are better to use than aerobic ones as they will produce larger volume changes.

D. Warm-blooded animals are better to use than cold-blooded animals as they do not change the temperature of the container.

B