From the standpoint of human existence, one likely answer might be:
1) Imagine
2) Procreate new humans
Note that all communication and technology answers (write novels, talk all day on the phone, build space rockets, split the atom) would all stem from the first point. Humans are not the only animals that use tools, but the only ones that can be trusted with power tools (some of us, anyway).
For the Cynical:
1) Ask pointless questions.
2) Answer sarcastically.
(see also the related link)
You cant, not really any ways. Objects or animals cant be stacked or on other objects or animals. it may appear that things are on top of things, but that's when there is a glitch in the game.
it only takes a tiny, tiny, little amount that you cant see or smell, but other animals can.
Yes, Pigs can donate heart valves and other organs but other animals cant
They cant throw up (vomit) but i dont know if there are any other animals that cant throw up either :)
yes cheetahs do kill with other animals they cant do it their self
Betrayal is a human trait animals cant betray humans because they need to make an informed agreement before they can break it which is betrayal. Domestic animals usually have a reason for turning on a human that can be traced back to human abuse.
No because it cant eat other animals.
the animals cant breathe and the most things die
many can things like horses and zebras cant because they have a sort of 1 way system which means it can only go out of their bottoms and not their mouths.
Probably because animals aren't the same as us. They evolve from other creatures from us and the animals they evolved from may have had better sight than us.
The human eye is not designed to see microscopic things.
No because it cant make sound