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Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells.
Unlike other animals, they lack true tissues and organs, and have no body symmetry.
Sponge biodiversity and morphotypes at the lip of a wall site in 60 feet (20 m) of water.
Included are the yellow tube sponge, Aplysina fistularis, the purple vase sponge, Niphates digitalis, the red encrusting sponge, Spiratrella coccinea, and the gray rope sponge, Callyspongia sp.
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They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.
Sponges are known for regenerating from fragments that are broken off, although this only works if the fragments include the right types of cells. When conditions deteriorate, for example as temperatures drop, many freshwater species and a few marine ones produce gemmules, "survival pods" of unspecialized cells that remain dormant until conditions improve and then either form completely new sponges or recolonize the skeletons of their parents.
The mesohyl functions as an endoskeleton in most sponges, and is the only skeleton in soft sponges that encrust hard surfaces such as rocks.Here come Sponge Bob and his trusted friend Patrick, probable tow of the most adorable babies ever seen.This playful couple needs your assistance today and as their super talented babysitter you'll... Help him find the perfect outfit for The Krusty Krab.More commonly, the mesohyl is stiffened by mineral spicules, by spongin fibers or both.Demosponges use spongin, and in many species, silica spicules and in some species, calcium carbonate exoskeletons.The fragile glass sponges, with "scaffolding" of silica spicules, are restricted to polar regions and the ocean depths where predators are rare.Tags: Adult Dating, affair dating, sex dating