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This is because of the surface area compared to the volume area

Eg. A small size : large surface area to a small volume.

Or the movement of required particles would take to long to sustain life if the cell is to big.

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12y ago
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12y ago

because humans might kill them if they become big.Or they might kill humans like virus and ameaba they are harmfull for humans.

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Q: Why are unicellular organisms such as euglena and paramecium restricted to being microscopic in size?
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