spicules
Natural sponges are sea animals that live on the ocean floor. They are harvested by divers, who carefully cut them from their base before allowing them to grow back. Once harvested, the sponges are cleaned, processed, and then sold for various uses.
Flint is unique to chalk, and chalk is entirely composed of the remains of tiny sea creatures called coccolithophores and diatoms. Their various shells and skeletons were composed of mainly calcium carbonate, with some species utilising silica. After the chalk was deposited, decompositional bacteria began to feed on organic matter and released sulphur-rich compounds. These compounds mixed with water and formed a weak acid which began to locally dissolve the calcium carbonate proto-chalk. The resulting void filled with a silica rich solution, which over time hardened along with the strata, forming the flint nodules within chalk bedding we see today.
sponges feed through their pores or holes, their pores create a current pulling food into the central cavity of the sponge. the food sticks to the collar cells that lines the central cavity, there the amoebocytes pick up the food and digest it, carrying the nutrients to the other cells.summary:porescollar cellsamoebocytesother cells.
Sponges lack a true body cavity.Sponges exhibit radial symmetry.Sponges lack true tissues.Sponges are autotrophs.Sponges have a true coelom.-@leilooni
An insulator or neither. The water inside of the sponge is what would conduct electricity.
All sponges have a skeleton made of a protein called spongin or mineralized structures composed of calcium carbonate or silica.
Sponges are examples of the class Calcarea. They are multicellular aquatic organisms that typically have a calcium carbonate skeleton, giving them a hard and brittle texture. Calcarea sponges are found in various marine habitats worldwide.
Sponges don't have skeletons! They are invertebrates which means the creature doesn't have a backbone, but in this case, it doesn't have a skeleton! (I think this is right, I apologize if it isn't)
No, cnidarians do not have spicules. Spicules are small, needle-like structures made of calcium carbonate or silica that are found in some sponges and echinoderms for support and defense. Cnidarians, such as jellyfish and corals, have a different type of support structure called a mesoglea.
Scientists classify sponges based on their body structure, specifically the presence of pores through which water flows for feeding and gas exchange. Additionally, they consider the type of skeleton sponges have, whether it's made of calcium carbonate, silica, or spongin fibers.
Some cnidarians - the jellyfish, sea anemones - have a hydro static skeleton. Sea pens use small hard pieces of calcium carbonate called spicules for support, like sponges, and the polyps of corals excrete exoskeletons, also made of calcium carbonate, that support their soft bodies.
A calcisponge is any of a group of marine sponges containing calcareous spicules - spicules which resemble calcium carbonate.
Spongin provides structural support in certain marine sponges by forming a flexible, protein-based skeleton. Spicules are tiny, needle-like structures made of calcium carbonate or silica that also provide structural support and protection in sponges, as well as help deter predators.
The Calcarea is a cellular sponge. They are strictly marine sponges. Their scientific name is Calcispongiae. They are made out of calcium carbonate.
Sponges belongs to family of coral reefs. their body is cvered with fibrous matter and the final last layer is covered the hard covering made up of Calcium carbonate. the outer covering of calcium carbonate helps them to protect them selves from their predators
Spicules are made of calcium carbonate or silica. These are tiny, needle-like skeletal structures found in marine sponges that provide support and protection to the organism.
Spicules are spiny structures of sponges, used to harden their outside and deter predators, making them harder to chew and digest. They can be made of a range of substances including silicium (glass!).