What is the name given to the excurrent pore of sponges?
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Answer:
Sponges:-
The sponges or poriferans (from Latin porus meaning "pore," and ferre meaning "to bear") are invertebrates of the phylum Porifera. They are primitive, sessile, mostly marine, water-dwelling filter feeders that pump water through their bodies to filter out particles of food matter.
Sponges represent the simplest of animals. With no true tissues (parazoa), they lack muscles, nerves, and internal organs. Among animals, sponges are the only group that exhibits true asymmetry, rather than a radial, bilateral, or spherical symmetry.
Sponges' porous nature (thus the name "pore-bearer") allows their practical use as household "sponges" to soak up and release water, having been harvested for this purpose since ancient times. Their diversity of forms and colors, with almost all colors of the rainbow represented, provides aesthetic appeal to humans.
Sponges similarity to colonial choanoflagellates (protists) shows the probable link or evolutionary jump from unicellular to multicellular organisms. As sessile animals, which attach themselves to surfaces and do not move, as opposed to chasing and capturing food, early biologists thought they were plants (Towle 1989). The larvae are free-swimming.
There are over five thousand modern species of sponges known, and they can be found attached to surfaces anywhere from the intertidal zone to as deep as 8,500 meters (29,000 feet) or further. Though the fossil record of sponges dates back to the Neoproterozoic era, new species are still commonly discovered.
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