What are ecosystems? What are two effects of human activities on your local ecosystems?

DQ 1
 
You are studying the community of a small pond and discover two similar species of fish. You believe they may be competitors, but you want scientific evidence to support or refute this idea. How would you conduct research, including studies you might carry out and findings you would expect if your hypothesis were true? Explain.
 
DQ 2
 
What are ecosystems? What are two effects of human activities on your local ecosystems? Explain.