How are flagella in unicellular organisms like legs in humans??​

Umm I don't know but this is what I found on the web, u can edit it

Explanation:

All three are related in terms of being forms of cellular motility and employing protein structures in order to accomplish their task.

Pseudopods are extensions of cell membranes, made using cytoproteins. Amoeba and human macrophages move by means of pseudopods. The mechanism of creating pseudopods is too long and complex for a Quora answer (you can look it up on Wikipedia or a biology textbook) but basically proteins inside the cell contract, creating extensions of the membrane which are then used as traction points to pull the rest of the cell in that direction.

Cilia and flagella are more closely related, as they are both like hairy extensions from the cell membranes. However Cilia (singular: cilium) are much shorter and are arranged in multiple groups, working together in coordinated manner to create movement along the cell membrane (kind of like the legs of a centipede). This movement could either be to propel the cell forward (as with paramecia) or move things past the cell (as with the cilia in the human respiratory system). Flagella (singular: flagellum, Latin for “whip”) are much bigger whip-like extensions that require a lot of energy to produce a great deal of propulsion. Their movement is both rotary and serpentine, and they are what drive sperm cells forward.

Flagellar motion causes water currents necessary for respiration and circulation in sponges and coelenterates. Most motile bacteria move by means of flagella. The structures and pattern of movement of prokaryotic and eukaryotic flagella are different.