Earth is the homeworld of the humans. Earth is smaller than the non-humans homeworld and also only has one moon, while the homeworld of the non-humans has seven moons. Earth's population is seven billion people, and Earth could be greater of lower in numbers compared to the non-humans. Since non humans can populate so quickly and maybe if there are more of them on their homeworld, than maybe non humans outnumber humans
Earth has a livable condition for both humans and non humans. Temperatures vary and terrain includes tundras, woodlands, deserts, forests, etc. The atmosphere is also very strong as it is able to hold in solar gases and stop meteorites from reaching Earth.