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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