To test the effect of red bull on running speed, a group of ten runners drink water before a race and are timed. A day later the same runners drink red bull before the race and are again timed. The times are compared and it turns out that they ran faster after drinking red bull. The running speed is the variable in this experiment.
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Ответ:
independent
Explanation:the red bull is isolated and is the only variable in the question that has changed.
Ответ:
Ответ:
Cutting down trees in a forest
Explanation:
Cutting down trees injuries the habitat, which then affects the animals because they don't have ways to escape from predators and they don't have homes to live in.