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What should you do to help prevent the spread of non-native species?

  1. Fill your bilge with fresh water

  2. Leave aquatic plants on your boat to dry

  3. Inspect your boat and remove any animals or plants before leaving the body of water

  4. Use non-native bait to fish

The correct answer is: Inspect your boat and remove any animals or plants before leaving the body of water

To help prevent the spread of non-native species, the best action to take is to regularly inspect your boat and remove any animals or plants before leaving the body of water. This is important because when non-native species are introduced to a new environment, they can have harmful impacts on the ecosystem. Option A, filling your bilge with fresh water, does not directly address the spread of non-native species. Option B, leaving aquatic plants on your boat to dry, may help in some cases but is not a guaranteed solution. Option D, using non-native bait to fish, directly contributes to the spread of non-native species. Therefore, option C is the most effective way to prevent the spread of non-native species.