Ecosystem in a bottle. I am desperate

[splehem]

Okay, so heres the deal. I have a paper due tomorrow about how i plan on making an ecosystem in a bottle, and what im going to test. But i have NO idea where to start. Mostly i need an idea for an experiment. It has to test how ecosystems work etc..not just the plants in it. What should i test?

 

i was thinking maybe seeing if plants grow better on their own or with other types of plants inside of the bottle, is this a good idea?

 

any ideas?

[h4tt3n]

You could always do a small number of identical worlds-in-a-jar, except that you "pollute" all but one with various chemicals or waste products.

 

You could use lead, cadmium, or even mercury and call it a heavy elements pollution project

 

Or you could use hydrochloric or sulphuric acid and call it an acid rain pollution project

 

Then you observe wether they evolve different than the pure sample or not.