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 - 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 …
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. Simple sponges are hollow cylinders with a large opening at the top through which water and wastes are expelled.
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.
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 …
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.
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.
sponges - Students | Britannica Kids | Homework Help
Sponges are among the most primitive multicellular animals alive. They lack specialized organs and tissues for breathing, eating, and eliminating wastes; instead, these tasks are taken care of by individual cells. Aristotle thought sponges were plants because of their appearance and lack of apparent movement.
SPONGE中文(简体)翻译：剑桥词典 - Cambridge Dictionary
sponge的发音是什么？ SPONGE翻译：材料, （擦洗物品用的）海绵, （用海绵或布）擦拭，擦洗, 蛋糕, 海绵蛋糕, 得到钱, 白吃，白要;（尤指）吃白饭, 清洗, 用湿海绵（或湿布）擦，擦洗。 了解更多。