Why don't we know how our dream will end

Cose we can't control our dreams, usually! We can't create our dreams wittingly! If you are aware that you are sleeping when you are sleeping, then it may be possible. There is a tiny chance to change the end, but even then you can't know the end.

What heats up our body to 36.6 degree?

Constantly burning calories, actually all the processes in our body can be done only with that temperature, so it's closed circle from the conception.

I never saw fish vomiting, can they do it?

I couldn't find an answer to that one.

Why Pandas never drink?

They get water in leaves and it's aparently enough.

Where it comes from that mouse like cheese?

As I know that mouses like oatmeal and cereals. It's just a beautiful concept.