Research Question, Hypothesis, and Variables

Research Question: How a sealed terrestrial ecosystem with a photoautotroph and a primary consumer affect plant height?


Hypothesis:
If a terrestrial mesacosm is sealed for more than three weeks with a cricket and peppermint plant inside, than it can continue to live sealed from the outside environment because the cricket will inhale oxygen (O2) and exhale Carbon Dioxide (CO2) while the peppermint plant will use photosynthesis to transform the carbon dioxide into oxygen and water and organic molecules.

The independent variable is the environments  being sealed in the mesocosm which is the variable to be manipulated.
The dependent variable is the height of the plant. This variable depends on the independent variable.
This will be measure in a combination of quantitive and qualitative data.