Question

there is any up side down world​

Answer 1

Answer:

The Upside Down has the same locations and infrastructure as the human world, though its environment is darker, colder, and there's a fog with ash-like spores floating in the air. Everything in it – buildings, cars, trees – appears to be rotten and is covered with root-like tendrils

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Answer 2

Answer:

it can be but it is not considered some insects have another world in the ground like ants