Crazy%20but%20true%2C%20life%20on%20Earth%20can’t%20exist%20without%20poop!%20Starting%20with%20human%20sewage%20then%20moving%20on%20to%20animal%20poop%2C%20this%20surprisingly%20charming%20lift-the-flap%20book%20explores%20what%20happens%20when%20we%20flush%2C%20what%20animal%20toilets%20look%20like%2C%20why%20animals%20don’t%20need%20to%20flush%20and%20just%20how%20important%20poop%20is%20-%20for%20a%20myriad%20of%20fascinating%20(and%20sometimes%20yucky)%20reasons.