Sponges are multicellular organisms consisting of jelly-like mesohyl sandwiched between two thin layers of cells, and usually have tube-like bodies full of pores and channels that allow water to circulate through them.

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Sponges are animals with dense skeletons that are highly adapted to their environments, although it is easy to see why they may be mistaken for plants. Sponges are found in a wide variety of colors, shapes, and sizes – and scientists believe that the colors of the sponge may act as a protection from the sun’s harmful UV rays.

Mar 22, 2025 · sponge, any of the primitive multicellular aquatic animals that constitute the phylum Porifera. They number approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of …

Mar 22, 2025 · Sponge - Anatomy, Filtering, Reproduction: Sponges are unusual animals that lack definite organs to carry out their various functions. The most important structure is the water-current system, which includes the pores (ostia), the choanocytes (collar cells), and the oscula.

Sponges are multicellular organisms belonging to the phylum Porifera. They are one of the simplest and oldest forms of animals on Earth. Sponges are considered animals because they are multicellular and lack cell walls, which distinguishes them from plants and fungi.

May 9, 2022 · Sponges help create habitat, filter particles from seawater, contribute to carbon, nitrogen, and silica cycling. They have also been used for bathing since ancient Egypt.

sponge, Any of some 5,000 species (phylum Porifera) of permanently affixed (sessile), mostly marine, solitary or colonial invertebrates, found from shallow to deep (more than 30,000 ft, or 9,000 m) waters.

Feb 9, 2019 · Sponges are a group of simple aquatic invertebrates that include glass sponges, demisponges, and calcareous sponges. Their body wall has three layers.

May 27, 2024 · Sponges are one of the simplest, and perhaps oldest, animals on the entire planet. They are marine animals that are easily mistaken for plant life due to their lack of nervous system, internal organs, and mobility.