Question

based on population counts conducted in winter, a bat colony infected by wns declined sharply in number, while an uninfected colony did not. this observation shows a correlation between wns and number of bats. is a prediction that correctly proves that wns causes bats to die. comes from an experimental study on wns and the effect on bats. shows a cause and effect relationship between wns exposure and bat survival

Explanation:

The observation notes that an infected bat colony declined while an uninfected one did not. This indicates a relationship (correlation) but not proven causation, as it is observational (not experimental) and lacks manipulation of variables. Predictions involve future events, which this is not.

Answer:

A. shows a correlation between WNS and number of bats.