Plankton
As juveniles. As adults, hydra become sessile and fasten to rocks. "Nekton" are creatures that swim, like fish.
Because it lives sessile, at the sea floor the answer is yes.
Their larvae stages are motile stages.
Analyzing concepts how is it possible for a population of sponges, which are sessile animals to disperse
Coral, oysters, and barnacles are all examples of sessile organisms.
No. Sponges are the simplest animals and they are aquatic and sessile (attached to a substrate). A slug is in the Phylum Mollusca in the Class Gastropoda.
sessile animals mean animals that can't move ,such as coral,ascdans,sea sponge etc...
Sponges are sessile, meaning they do not move. Once a sponge chooses a place to be, it usually remains there for life.
Sponges are sessile organisms during their adulthood, meaning they do not move. To feed, sponges have adapted a process known as "filter-feeding." Basically, small particles of food passing by in the water are taken in by the sponge and digested directly in the sponge's cell layers. The larvae also feed this way, although they are not sessile and are free swimming.
a hydra as a polyp is not sessile but when it grows to be a hydra it is sessile
nekton can be any color
Nekton is an aggregate of actively swimming aquatic organisms. This nekton is no drifter! Squid are a classic example of nekton.