1. It allows the scientist to determine the effect of the changed variable.
Let's say there was an experiment showing the effect of water on plant growth. The environment (in this case, the other variables including the amount of sunlight) would need to be kept under control in order for the results to be clear. If there was a different amount of sunlight during each trial, then the results would be effected by both the water and sunlight, making the results incorrect for the experiment.
The answer is it is reflected.
Answer:
Evaporation.
Explanation:
Most cases of dropping water levels are simply evaporation, usually caused by higher temperatures in warmer climates.
Answer:
Mice and rats make up approximately 95% of all laboratory animals, with mice the most commonly used animal in biomedical research.