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First of have 2 survival worlds and one creative
Then use IExplorer and extract the level.dat from the creative world
And replace it with one of the survival world level.dat
Then open your Survival/Creative mixed world and build a house
Then using IExplorer extract the level.dat from the other survival world
And replace the level.dat from the world you built a house with the one you extracted from tithe other survival world
And enjoy!!!
Also the Creative/Survival mode have animals