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1.You notice green scum floating on the surface of a pond. How can you tell whether these organisms are plants?

2.Explain, using an example how water may become polluted

3.Why is conservation important today?

4.Most people drive cars and heat their homes with petroleum, coal, or natural gas. Why is it important to find alternatives for these sources of energy? What are three examples of alternatives?

5.Describe how burning fossil fuels has created an imbalance in the carbon cycle.

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    I'm stuck on dis one.

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