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.
What is a sponge? - NOAA's National Ocean Service
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.
Sponge | Definition, Features, Reproduction, & Facts | Britannica
2024年11月5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.
Sponge - Anatomy, Filtering, Reproduction | Britannica
2024年11月5日 · Sponges are unusual animals in that they lack definite organs to carry out their various functions. The most important structure is the system of canals and chambers, called a water-current system, through which water circulates to bring food and oxygen to the sponge.
Sponge (animal) - Simple English Wikipedia, the free encyclopedia
A sponge is a member of the phylum Porifera. It is a simple animal with many cells, but no mouth , muscles , heart or brain . It is sessile : it cannot move from place to place the way most animals can.
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 - A-Z Animals
2024年5月27日 · 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.
What Are Sponges and Why Do They Matter? - NOAA Ocean …
2022年5月9日 · A sponge instead gets everything it needs from ocean currents, which deliver food and oxygen as water flows through the sponge’s body. It’s a simple strategy, but it works: Sponges have been around for hundreds of millions of years and have evolved into a …
15.2: Sponges and Cnidarians - Biology LibreTexts
2021年9月23日 · The sponges and the cnidarians represent the simplest of animals. Sponges appear to represent an early stage of multicellularity in the animal clade. Although they have specialized cells for particular functions, they lack true tissues in which specialized cells are organized into functional groups.