Well, firstly, you've stumbled upon a site that's made up mostly of exJWs and those who are no longer believers in JW doctrine but are stuck in the cult for one reason or another, so this may not be quite your intended audience.
I forget how they try to weasel out of the error that the hare chews it's cud when that's really not the case. I assume that's what you're talking about. They probably dismiss it as being that they appear to chew their cud and the isrealites would've thought this to be the case, so the bible was written in a way to make it easier for them to understand. I don't know for sure, but I'm sure it's nonsense.
The days thing in genesis is easy - that refers to "figurative days" which is simply a period of activity with a particular goal.