Mine Craft needs more biological diversity but the flora and fauna needs to have a reason to be added like a Palm Tree could be a tree that only can grow on sand by water and can give you cocoanuts which could be used as food and the tree it's self is a source of wood I would only see it as a win winin the world of Mine Craft I think adding more plants and animals into the game would be a great thing so if you have any ideas please share them.
They're called Chests.