https://en.wikipedia.org/wiki/Sponge
Sponges are multicellular animals with bodies full of pores and channels that circulate water. They are the sister group of all other animals and have diverse shapes, habitats, and skeletons.

https://www.britannica.com/animal/sponge-animal
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 8,500 metres (29,000 feet) or more. The members of one family, the Spongillidae, are found in fresh water; however, 98 percent of all sponge species are

https://byjus.com/biology/porifera/
Learn about Porifera, the lowest multicellular animals with pores and no organs. Find out their features, types, examples and FAQs on this web page.

https://ucmp.berkeley.edu/porifera/porifera.html
Learn about sponges, the oldest and simplest animals, with unique feeding and cellular features. Explore the diversity, evolution, and ecology of the phylum Porifera, with links to more resources and references.

https://www.digitalatlasofancientlife.org/learn/porifera/
Learn about the diversity, phylogeny, and fossil record of sponges, the simplest animals on Earth. Explore their features, body plans, and ecology with images, videos, and 3D models.

https://www.youtube.com/watch?v=u5Qz9-iCZoY
Learn about sponges, the animals that belong to the phylum Porifera, with this video from Khan Academy India. Discover their water transport system, choanocytes, spicules, spongin, and reproduction modes.

https://www.britannica.com/summary/sponge-animal
Learn about the simple, saclike, and sessile animals of phylum Porifera, also known as sponges. Find out how they feed, reproduce, and have a porous skeleton composed of spicules or spongin.

https://animaldiversity.org/accounts/Porifera/
Learn about sponges, a diverse group of marine and freshwater animals with cellular-level organization and a system of pores and canals. Find out their characteristics, reproduction, body plans, ecology, and interactions with other organisms.

https://bio.libretexts.org/Courses/Lumen_Learning/Fundamentals_of_Biology_I_(Lumen)/14%3A_Module_11-_Invertebrates/14.15%3A_Introduction_to_Phylum_Porifera
The invertebrates, or invertebrata, are animals that do not contain bony structures, such as the cranium and vertebrae. The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges (Figure 1). Parazoans ("beside animals") do not display tissue-level organization, although they do have

https://oceanservice.noaa.gov/facts/sponge.html
Learn about sponges, simple aquatic animals with porous skeletons that belong to the phylum Porifera. Discover their diversity, evolution, ecology, and importance for coral reefs.

https://bio.libretexts.org/Bookshelves/Marine_Biology_and_Marine_Ecology/A_Student's_Guide_to_Tropical_Marine_Biology/05%3A_Major_Marine_Phyla/05.1%3A_Phylum_Porifera
Learn about sponges, the simplest multi-cellular animals with no organs or nervous system. Find out their diversity, structure, reproduction, symbiosis, and ecology in this chapter from a student's guide to tropical marine biology.

https://www.thoughtco.com/sponges-profile-p2-130755
Sponges are primitive multicellular animals that live attached to hard surfaces in marine or freshwater habitats. They have no organs, no digestive system, and no nervous system, but they are filter feeders that use water current to capture food and oxygen.

https://animalia.bio/index.php/porifera
Sponges (also known as sea sponges ), the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.</p><p>Sponges have unspecialized cells

https://openstax.org/books/biology-2e/pages/28-1-phylum-porifera
Morphology of Sponges. There are at least 5,000 named species of sponges, likely with thousands more yet to be classified. The morphology of the simplest sponges takes the shape of an irregular cylinder with a large central cavity, the spongocoel, occupying the inside of the cylinder (Figure 28.3).Water enters into the spongocoel through numerous pores, or ostia, that create openings in the

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/28%3A_Invertebrates/28.01%3A_Phylum_Porifera/28.1A%3A_Phylum_Porifera
Phylum Porifera ("pori" = pores, "fera" = bearers) are popularly known as sponges. Sponge larvae are able to swim; however, adults are non-motile and spend their life attached to a substratum through a holdfast. The majority of sponges are marine, living in seas and oceans. There is, however, one family of fresh water sponges (Family

https://ucmp.berkeley.edu/porifera/poriferalh.html
Learn about the diversity, feeding, and reproduction of sponges, the simplest animals with multicellular bodies. Find out how some sponges are carnivorous, symbiotic, or move slowly, and how they are distributed in different habitats.

https://manoa.hawaii.edu/exploringourfluidearth/biological/invertebrates/phylum-porifera
Learn about the sponges, the simplest animals with pores that filter feed and live in aquatic habitats. Find out their anatomy, diversity, evolution, and ecological roles.

https://www.inaturalist.org/taxa/48824-Porifera
Sponges, the members of the phylum Porifera (/pɒˈrɪfərə/; meaning 'pore bearer'), are a basal Metazoa clade as sister of the Diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.

https://microbenotes.com/phylum-porifera/
Learn about the phylum Porifera, also known as sponges, which are aquatic, multicellular organisms with a cellular grade of organization and a characteristic skeleton. Find out the three classes of sponges based on their skeletal types and the examples of each class.

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_1e_(OpenStax)/5%3A_Biological_Diversity/28%3A_Invertebrates/28.1%3A_Phylum_Porifera
Learn about the simplest multicellular animals, the sponges, that belong to the phylum Porifera. Discover their morphology, cell types, feeding, reproduction, and evolutionary relationships.

https://www.youtube.com/watch?v=g251sMCwEEw
The sponges are the first animals to have evolved from our choanoflagellate protist past. While they lack many of the things we see in other animals such as

https://www.youtube.com/watch?v=m8a0oNsDEx8
A sponge might not look like much, but these simple animals with no brain or ability to move have lived on Earth for hundreds of millions of years. They can

https://facts.net/science/15-fun-facts-about-porifera/
Sponges, or Porifera, are the oldest and simplest multicellular animals, with over 8,500 species. They play a vital role in marine ecosystems and have inspired new materials and designs. Porifera, or sponges, are fascinating creatures that can filter feed, reproduce in different ways, and even produce compounds with potential medical applications.