What is life? please define it?

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What is life? Does this sound like a strange question to you? Of course we all know what is meant my the word " life", but how would you define it? Do all living things move? Do they all eat and breathe? Even though we all seems to know what is meant by saying somethings is " alive", It's not very easy to describe what "life" is. It's almost as hard as describing where life. Even the biologists ( people who study life) have a tough time describing what life is! But after many years of studying living things.