Answer:
The independent variable were the different air conditions of the houses in which the bats were kept.
The dependent variable was signs of WNS in the bats.
Explanation:
In a scientific experiment, an independent variable can be described as a variant that is either changed by the researcher or changes naturally. The effects of the changes in the independent variable are determined on the dependent variable in a scientific experiments. As the differences in the air conditions on WNS were being checked hence, it was the independent variable.
The dependent variable is under study in a scientific experiment. As WNS being tested in the experiment, hence it is the dependent variable.