Single-celled organisms
Why?
Single-celled organisms such as bacteria, amoebas and yeast do everything life needs inside one cell.
A paramecium swims through pond water by beating thousands of tiny hairs, turning round when it bumps into a stone.
Press the button to follow a swimming paramecium and watch yeast raise bread dough.
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Yeast cells in warm bread dough eat sugar and give off bubbles of gas, making the dough rise.
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