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1. www.britannica.com › animal › sponge-animalSponge - Filter Feeding, Skeleton, Reproduction | Britannica

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   Sponge - Filter Feeding, Skeleton, Reproduction: Sponges are primarily filter feeders. They lack respiratory organs and excretion occurs through the oscula and the surface of the sponge. A primitive system of coordination exists. They produce substances with antibiotic activity. Sponges probably arose from flagellated protozoans. The first sponge skeletons appear in rocks of the Ediacaran Period.

2. ucmp.berkeley.edu › porifera › poriferaIntroduction to Porifera

   ucmp.berkeley.edu › porifera › porifera

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   The approximately 5,000 living sponge species are classified in the phylum Porifera, which is composed of three distinct groups, the Hexactinellida (glass sponges), the Demospongia, and the Calcarea (calcareous sponges).

3. bio.libretexts.org › Bookshelves › Introductory_and11.4: Sponges - Biology LibreTexts

   bio.libretexts.org › Bookshelves › Introductory_and

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   Mar 6, 2021 · Spicules are made of silica, calcium carbonate, or spongin, a tough protein. They grow from specialized cells in the body of the sponge. Sponge Anatomy. A sponge lacks tissues and organs, but it has several types of specialized cells. Sponges are filter feeders. They pump water into their body through their pores.

4. www.amazon.com › Sponges › sAmazon.com: Sponges

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   Scotch-Brite Zero Scratch Scrub Sponges, 6 Kitchen Sponges for Washing Dishes and Cleaning the Kitchen and Bath, Non-Scratch Sponge Safe for Non-Stick Cookware

5. en.wikipedia.org › wiki › Sponge_(tool)Sponge (tool) - Wikipedia

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   A sponge ( / ˈspʌndʒ / SPUNJ) is a cleaning aid made of soft, porous material. Typically used for cleaning impervious surfaces, sponges are especially good at absorbing water and water-based solutions. Originally made from natural sea sponges, they are most commonly made from synthetic materials today.

6. dictionary.cambridge.org › dictionary › englishSPONGE | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   SPONGE definition: 1. a soft substance that is full of small holes and can absorb a lot of liquid, and is used for…. Learn more.

7. www.shapeoflife.org › video › sponges-originsSponges: Origins | Shape of Life

   www.shapeoflife.org › video › sponges-origins

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   The ancient sponge appeared about 2.5 billion years ago—the first animal. Coming in many sizes and shapes, sponge bodies are a loose assemblage of cells held together by a special protein called collagen which is present in all animals. In addition, sponges have microscopic crystalline spicules that act as a skeleton. We see an animated view of the incredible variety of shapes of these ...