Sponge - Wikipedia
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.
Sponge | Definition, Features, Reproduction, & Facts | Britannica
2024年9月28日 · 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 …
Sponge Definition & Meaning - Merriam-Webster
The meaning of SPONGE is an elastic porous mass of interlacing horny fibers that forms the internal skeleton of various marine animals (phylum Porifera) and is able when wetted to absorb water. How to use sponge in a sentence.
What is a sponge? - NOAA's National Ocean Service
Sponges are very simple creatures with no tissues. All corals require saltwater to survive. While most sponges are found in the ocean, numerous species are also found in fresh water and estuaries. Regardless of these differences, sponges are …
Sponge - A-Z Animals
2024年5月27日 · What does a sponge do? Most sponges rely on their pores and internal channels to filter out microscopic food from the surrounding water. They also serve an important structural and symbiotic role in ecosystems, providing a source of food and shelter for many other animal species.
Facts About Sponges (Porifera) - ThoughtCo
2019年2月9日 · Sponges (Porifera) are a group of animals that includes about 10,000 living species. Members of this group include glass sponges, demosponges, and calcareous sponges. Adult sponges are sessile animals that live attached …
Characteristics and life cycle of sponges | Britannica
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.
Sponge - Anatomy, Filtering, Reproduction | Britannica
2024年9月28日 · 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.
sponge - Kids | Britannica Kids | Homework Help
A sponge’s body is a soft mass of cells supported by a skeleton. Holes in a sponge’s skin let water flow inside. Sponges take food and oxygen from the water. Sponges are useful to people. People collect sponges and then dry, clean, and trim them. The fleshy parts are thrown away, and only the skeleton is used.
Sponge - New World Encyclopedia
Sponges represent the simplest of animals. With no true tissues (parazoa), they lack muscles, nerves, and internal organs. Among animals, sponges are the only group that exhibits true asymmetry, rather than a radial, bilateral, or spherical symmetry.
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