Can you prove that fairies don't exist?

Amangrove community in a coastal area contains mangrove trees mangrove water snakes

If pressure and temperature remain constant, will the volume of gas in the respirometers increase or decrease?

What information does a survey provide? a. an accurate description of the population surveyed b. whether there is a predictive relationship between two variables? c. whether there is a cause-and-effect relationship between two variables d. none