microtubules vs microfilaments evolution

Why might natural selection have favoured the use of microtubules (rather than microfilaments or intermediate filaments) for pulling chromatids to the cell poles during cell division?


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  • The cytoskeleton is a complex, dynamic network of interlinking protein filaments present in the cytoplasm of all cells, including bacteria and archaea.[1] It extends from the cell nucleus to the cell membrane and is composed of similar proteins in the various organisms. In eukaryotes, it is composed of three main components, microfilaments, intermediate filaments and microtubules, and these are all capable of rapid growth or disassembly dependent on the cell's requirements.[

Biology

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