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Biology - Summary - cell basics 2

Summary - cell basics 2

* All living organisms are made up of cells.

* Many unicellular organisms are aquatic. Often they possess either cilia
or flagella helping them move around in their environment.

* As a cell increases in length (provided its shape remains the same) its
surface area: volume ratio decreases. This makes it difficult for it to
obtain sufficient "nutrients" or rid it self of wastes to survive.

* Viruses are infectious particles. They are not cells.

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