Your teacher gives you a task in science class. you must decide which of the five samples you are given are alive or were once alive. one specimen is a crusty gray-green object. what is the best clue you could use to decide: living thing or not a living thing?

The best clue that can be used to decide living thing or not a living thing is the observation of living or dead cells present in the specimen. All the living or dead organisms exhibit cells. Cell is a structural and functional unit of life. The growth and metabolism of living organism are dependent upon a cell. A cell in a life form exhibit organelles and components which are not found in non-living objects.