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Nearctic

a. 新北区的

新北区的

The Collaborative International Dictionary of English v.0.48 (gcide)

Nearctic \Ne*arc"tic\, a. [Neo arctic.]
Of or pertaining to a region of the earth's surface including
all of temperate and arctic North America and Greenland. In
the geographical distribution of animals, this region is
marked off as the habitat certain species.
[1913 Webster]

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Natural sea sponges are made up of a network of tiny, interconnected fibers called spongin, a type of collagen protein This fibrous skeleton gives the sponge its soft yet sturdy texture, perfect for gentle scrubbing
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Sponges are comprised of either natural materials, primarily the skeletal framework of marine sponges (spongin), or synthetic polymers like polyurethane and cellulose, creating a porous structure ideal for absorbing liquids and cleaning
Porifera - MESA
The body of a sponge consists of jelly-like material (mesohyl) made mainly of collagen and reinforced by a dense network of fibres also made of collagen sandwiched between two thin layers of cells Many also have a skeleton made up of spicules of calcium carbonate or silica
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