Question

practice it! select the statement(s) that indicate an experiment. a scientist bounces three different brands of tennis balls on a court to see which bounces the highest. a group of scientists travel to nova scotia to observe the behaviors of the star - nosed mole. the black bear begins to hibernate in september, while the brown bear begins to hibernate in november. when placed in saltwater and freshwater, the egg in the saltwater floats. scientists give ants white sugar and brown sugar to see which they eat more.

Explanation:

An experiment involves manipulating variables to observe the effect. Bouncing different tennis - balls to compare bounce height, placing an egg in different water types to see floating behavior, and giving ants different sugars to see consumption are experiments as they involve changing one factor and observing the outcome. Observing mole behavior and bear hibernation times are observations, not experiments.

Answer:

A scientist bounces three different brands of tennis balls on a court to see which bounces the highest.
When placed in saltwater and freshwater, the egg in the saltwater floats.
Scientists give ants white sugar and brown sugar to see which they eat more.