Question

I have an assignment on environmental regionalisation of the world ....which basis would I consider to be best for it ...would I consider Climatic types of the world .or different environmental types .. i.e- biomes ....
If I consider Climatic types then it doesn't include flora and fauna
...if I consider biomes it doesn't include the climate .....

What would I do now ?!

Plz ..waiting for your answer ...