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What Are Cells? (in human body we have nerve cells that can be as long as…
What Are Cells?
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Robert Hooke, an English scientist, observed a layer of cork through a microscope.
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Plants and animals have certain cell structures in common, but they always have differences.
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A protist is a simple organism, usually a single cell with a nucleus and organelles.
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The plant only have the cell wall, but the animal don't have it.
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Some simple organisms are just a single cell. But most plants and animals are made up of huge numbers of cells
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