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For the paramecium to move forward, its cilia beat on an angle, backward in unison. This means that the paramecium moves by spiralling through the water on an invisible axis. For the paramecium to move backward, the cilia simply beat forward on an angle in unison.

If the paramecium runs into a solid object, the cilia changes its direction and beats forward, causing the paramecium to go backward. The paramecium turns slightly and goes forward again. If it runs into the solid object again it will repeat this process until it can get past the object

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13y ago

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