To keep from being eaten by other animals- or to catch other animals to eat.
They're more flexible and can move quickly.
Give it structure and a way to move things around
Too much MASS
In most cases the reason is either the availability of food resources or temperature (or both).
Plant cells have cell walls. Animal cells do not. The reason why animals do not have cell walls is so that we are flexible enough to move around (which plants do not need to do).
to move quickly.
They move slowly in the day from the predators but quite quickly in the night because it will be dark.
You will have to be mean to it. Do stuff like wack it with a net, or don't approve it's birthday present you get, or come to their party, and not give them a present.
I guess they do.. There is no reason that they wont move... They are not a lazy animal i suppose...
Yes......mostly they do move fast.
Move quickly
Cats move quickly because they have four legs and great agility because their so small