5. The Ani's eat in their wolf morphs to avoid starving. Does that food carry through when they demorph and remorph? Or do they go back to hungry?
With the whole Z-Space thing, also remember that they shift into morphs, they just don't pop into something new. Organs get shifted and changed, mass is changed, not being removed and then replaced. I think anything the morph has metabolized would have stayed as a human. I think this is why morphs don't starve (Think about how many hours Jake spent as a tiger; is he ever described as eating?) I think metabolized energy transfers between morphs. It is noted that, while flesh wounds are healed, hunger, thirst, and the need for sleep all remain.
Still, this leads to yet more problems. For instance, when something massive is morphed from human, it would use all the metabolized energy remaining in the human body in minutes or seconds or less. Would it then starve? Yet Cassie's whale is always fine.
Also, most arctic animals (polar bears, walruses, etc) Have a MASSIVE amount of Vitamin A in their livers. As in, you eat a sizeable portion of a liver from these animals, and you die from OD of Vitamin A. If you morph from human, with a far smaller amount of the vitamin, does the arctic morph instantly get sick from the lack of the vitamin, or assuming the body creates it, why doesn't the human get sick from all the Vitamin A now in the system when they demorph?
Assume everything needed is created by the body (which is probably impossible), and anything in excess is extruded into Z space. How do clothes morph then, while a tiny language chip (AC) or microprocessor (One with the Hammerheads) inside the body cannot? If I put something in my mouth, morph, would it be expelled from the body or transferred to Z space? How does it know to push out bullets but not undigested food? It could be claimed that only organic materials would go with the extruded mass (Food vs metal), but then why do the spandex (Synthetic fiber) morphing suits get extruded?
This isn't even getting into how age is determined from DNA or things like haircuts and nail length are maintained.
I feel it's safe to say that it's a work of fiction and there cannot be a foolproof explanation for every aspect. :'(