Every different cell has their own functions which causes them to have different structures. There are big cells that are like tissues, and also way smaller cells like organelles. The different variety of cells go on and on, but it is something that keeps everything on Earth alive. There are many cells that live in our body too, and some are quite obvious like blood cells, or brain cells. Animal's don't have a cell wall, but plants have one. The chloroplast in a plant cell allows the plants to take in energy from sunlight.
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