Section: Science

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Which of the following responses to an acid rain-caused fish kill would have the best chance of preventing the problem from reappearing?

1. restocking the lake with heartier fish
2. allowing the stronger fish to survive and then reproduce
3. seeding clouds so that the rain falls elsewhere
4. reducing the amount of air pollution created
5. adding large amounts of ammonia to the lake to neutralize the acid

The best approach would be to reduce or stop the problem at its source. The other choices would do nothing to prevent the same problems from reappearing again.