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1 In the first example you can provide an experiment with agrobacter and a plant causing tumer, .....see some details here
http://www.newton.dep.anl.gov/askasci/bio99/bio99765.htm
Here the agrobacter with the interaction with the plant causes nitrogen fixation ( see details)
Some more ideas.......
As some other example you can take a parasite and the host, eg an animal and provide an experiment hypotheses about the life cycle of the parasite and its relation with the host animal.
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=98982