Energy, growth, evolutionary and ecological describe different biological life cycle. Life cycle involves all those living organisms in the earth. Life cycle involves energy that every living organisms need, growth that every living organism undergo, evolution and ecological.
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1) Skin is the largest organ in the body because it surrounds the whole human body.
2) It is classified as an organ because of the fact that it is many cells working together to achieve the same goal and that is basically what an organ does.
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pure research or fundamental research which is a type of reach with the idea of improving scientific theories. :)