Sessile
An organism that does not move. It remains attached to one place(the bottom or to a surface)
Sessile is a term used to describe living organisms that are attached to a surface and cannot move around freely. Sessile organisms may include plants, fungi and animals such as sponges, barnacles and corals. Sessile organisms are typically anchored to a substrate by adhesive substances produced by the organism itself, or via suction, or by hard structures such as shells.
Sessile organisms usually have to rely on external factors like currents, water and wind for the transportation of nutrients, oxygen, and reproductive cells to different parts of their body. Sessile animals often have elaborate filter systems involving their siphons, cilia, or tentacles for catching food. Many sessile organisms have unique physiological and evolutionary adaptations to survive in their fixed environment, such as the ability to regenerate tissue and a strong immune response to fight infection.
In summary, sessile organisms refer to those that are fixed in one location and are unable to naturally move around their environment. They have specialized adaptations and depend on external factors for their nourishment and survival.
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