1. In two well-developed paragraphs, list and explain at least three changes to the environment that can lead to the spread of infectious diseases.
2. In two well-developed paragraphs, describe the current causes of an increased temperature on Earth. Describe what a warmer Earth would be like, including what effect it would have on the world around us.
3. In two well-developed paragraphs, list five pollutants affecting the environment and human health. Also list the source of each of these pollutants, and identify the possible effects of each one as well.
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