The diversity of locomotion strategies existing in the natural world is immeasurable. It is the result of millions of years of evolutionary processes, which have resulted in amazing adaptations to the most varied means.
Most living things need to move, that is, move the entire body from one place to another, at least during some stages of its life cycle. The reasons are very varied, and can be related to the search for a partner for reproduction, food or a territory free of competition to occupy.
Even plants, through different mechanisms, disperse their seeds and pollen and fungi their spores. In any case, to achieve this, they are dependent on the ride from the wind, a river, a bee or the fur of a mammal.
But there are organisms that cannot be dependent on these random displacements and that need to move independently of other factors, that is, they need to move autonomously.
Despite being unquestionably the masters in matter, animals are not the only living beings to have the ability to move around. Some species of bacteria (single-celled organisms belonging to the Monera kingdom), have flagella or pylons, which are organelles dedicated to displacement in liquid media. Also among the single-celled eukaryotic organisms, belonging to the Protista kingdom, are the Protozoa, which are subdivided into classes, precisely because of their locomotion processes. Some have flagella, others have pseudopods or cilia, and others have no locomotion organelles. Like bacteria, protozoa also only move in fluid media.