Many spongins have an internal skeleton of spongin and / or spicules (skeleton-like fragments) of calcium carbonate or silicon dioxide. All sponges are sessile aquatic animals. That is, it sticks to the surface of the water and stays in place (that is, does not move).
Why is the sponge stuck?
Adult sponges are unpatterned. This means they can't move from place to place. Root-like protrusions secure them to hard surfaces such as rocks and coral reefs. The sponge has an internal skeleton that provides support and protection. 2021
Is the sponge a stemless organism?
The phylum Sponge (Porifera) contains stalkless organisms, most of which live in marine habitats. Several species of freshwater all belong to the Demosponge (Demosponge). Sponges inhabit colonies and represent a level of differentiation that has not reached the actual level of tissue differentiation.
Why are sponges called stemless?
Since the sponge is stuck, it cannot move, so it filters water and feeds. They do not have a brain, stomach, or other organs. They don't even have a real organization. Instead, their bodies are made up of specialized cells (tissues at the cellular level) that do specific tasks. 2019
How are sponges classified?
Approximately 8,550 species of living sponges are scientifically classified into the phylum Porifera, which consists of four different classes. (Calcareous spongeum), and Homo screlomorpha.
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