Question

A cloud is a non - living thing even it can move and grow bigger. Explain why?

Answer 1

I guess even trains, bikes, cars, clock hands, reels, keys, water, oil etc etc can also be added to the list of living things since they can move?

A living thing isn't something that can move. It is something that possesses a life. A living cell which can take in oxygen. So, microorganisms, plants, animals come under the category of living things.

And probably aliens, if they exist. Although they may be using another gas for their survival.