CO2 Chamber With Oxygen? Please Help

[kalieta]

Hello everyone,
I hope i am posting in the right category. I want to conduct a project that involves the used of CO2 and O2 in a contained environment to monitor how living organisms adapt to the environmental changes. In this case, I would like to use worms and plants. I want to inject doses of CO2 into the closed container but at the same time provide the container with O2 so the plants and worms don't die. Does anyone have an idea how I could do it? I was thinking on building a normal CO2 chamber and hook-up a tube that would provide the O2, and then inject with a syringe the amount desired of CO2? What do you guys think?

Thanks in advance for any help