Worldbuilding Guide Part 8: Life & Evolution

Links to previous parts: Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, and Part 7
Finally, the physical properties of your universe are complete! Let us populate it! This section details how to create a fully fleshed out and realistic biosphere for any habitable planet of your choosing given its atmospheric composition, gravity, sea level, plate tectonics, etc, all things covered in previous parts. It is not entirely necessary to do this section if you don't want to, but if you want to it will improve your universe's detail. This will also detail how to create a sapient species without requiring information on the rest of the biosphere first, which many choose to do instead. 
WIP
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Category:Worldbuilding Guide