Amoeba moves when:

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(C) According to the $Sol-Gel$ theory (or $Amoeboid$ movement theory),the movement of $Amoeba$ is caused by the reversible transformation of the cytop

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Upper part of plasma-sol changes into plasma-gel

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(C) According to the $Sol-Gel$ theory (or $Amoeboid$ movement theory),the movement of $Amoeba$ is caused by the reversible transformation of the cytoplasm between $sol$ (fluid) and $gel$ (viscous) states. When $Amoeba$ moves,the $plasma-sol$ at the anterior end converts into $plasma-gel$ to form the pseudopodium,while at the posterior end,$plasma-gel$ converts back into $plasma-sol$. Thus,the correct mechanism is that the upper part of $plasma-sol$ changes into $plasma-gel$ at the site of pseudopodium formation.

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