Dr. Blehert took healthy bats into his laboratory. He exposed some of them to the fungus suspected of causing white-nose syndrome (WNS). The rest of the bats were not exposed to the fungus but were otherwise kept under the same environmental conditions. This method of manipulating one or more aspects of the natural world in a repeatable manner and with the intention of answering a specific question is called a(n)

Question

Choose one:
A. controlled experiment.
B. independent variable.
C. peer review.
D. hypothesis.

Answer 1

A. controlled experiment.