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Background Information: Ecologists have noticed that the fish in a local river have started to die. Some have suggested that this be because of the pollution from a nearby brewery, which is disrupting the food chain. It is thought that the pollution could influence the heart rate of small invertebrates such as a Daphnia pulex, which will eventually die. Scientific Knowledge that alcohol is a depressant, which slows down the heart rate. The brain is the first organ to be affected by alcohol, because it has many blood vessels. It slows your thinking, affects your judgement, and dulls your senses. As more alcohol is absorbed into the blood stream, the cerebellum and medulla are affected. The co-ordination, balance, reaction time, and then vital body functions such as the heartbeat, breathing rate, and digestion are affected. If you continue drinking alcohol at this point the brain's functioning can slow enough to result...

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