What changes in the structure of protozoa led to an increase in the speed of their movement?

The ancient protozoa had a primitive structure of the organism, which made it difficult for their free movement in space. In the process of evolution, protozoa developed organelles of movement – flagella and cilia, for example, in green euglena. In some unicellular organisms, supporting fibrils have formed, as, for example, in Trichomonas.

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