I am planning to conduct an experiment on the effects pesticides have on lifespan. I want to make this a valid experiment, so I have questions on how to go about doing this. I am planning on having two groups: one fed only conventional foods and another fed only organic food. I plan on treating the conventionally-fed mice as the control group, but should I have a separate control group fed with only mouse food? Also, how many mice should I have in each group? I don't have access to a lab, so can my experiment still be valid if I keep them at my house? Thanks for all the help!