Make a claim to answer the question:  How different pollutants contaminate our water resources?
Information presented in the video and the rest of the chapter will provide EVIDENCE to support your claim or you may find evidence that make you change your claim. Which you can!!  As long as the evidence supports the new claim.
When all of the evidence has been collected, you will explain the reasoning for your claim using the evidence as support
https://youtu.be/GNGKsubYJ9U