How can I recreate a space with the same atmosphere as mars?

I have to do a science project for school and I am currently in the deciding-what-to-do stage. You see, I want to do my project on whether it is possible to live on mars. And I wanted to make a space with the same atmosphere as mars. I think I know roughly how to create an oxygen free space (by burning a candle in an airtight container until it snuffs out, taking all the oxygen in the container with it) but i then want to test the growing of tress in this environment. So any ideas on how I can do this? I know this idea has many flaws in it so any advice on how to create a space with the atmosphere of Mars would be great :)