Why is it necessary for sponges to have pores?

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Look at the first site, first line.
http://www.google.com/search?q=sponge+pores&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Sorry (DrBob222)but this information isn't helping because I need to find out WHY they need PORES.

Look Terrae, I found that site and I read it before I posted it for you to read. It clearly (note I wrote CLEARLY) that the sponges feed through those pores. The second site I gave you said that in the first sentence. I don't know how it could be stated any clearer. You must understand that we are here to try and HELP but we don't actually DO the homework. If we provide a site for you to read, its your responsibility to read the material, digest it, and write your paper/homework/paragraph or what have you yourself. You will never learn if you insist on others doing your work for you and that's what you seem to be doing.

Sponges have pores to fulfill their basic biological functions, such as filtering food particles and oxygen exchange. The pores, also known as ostia, are essential for the sponge's filter-feeding mechanism. They allow water to enter the sponge, bringing in food particles and oxygen while expelling waste and carbon dioxide.

To understand why it is necessary for sponges to have pores, let me explain how sponges feed and respire. Sponges are sessile animals that live in aquatic environments. They rely on filter feeding to obtain their nutrients. The cells lining the internal cavity of a sponge create water currents by beating their whip-like appendages, known as flagella. These currents draw water into the sponge through the pores.

As water enters through the pores, it carries with it small organic particles, such as plankton and other microorganisms, which serve as food for the sponge. The water passes through the internal canal system and eventually exits through a larger opening called the osculum, expelling waste and carbon dioxide.

The pores are important because they allow water to enter the sponge and keep the internal canal system continuously supplied with fresh water. Without pores, the sponge would not be able to filter-feed efficiently or respire properly. The pores provide a way for the sponge to capture and utilize food particles while obtaining oxygen for respiration.

In summary, pores in sponges are necessary for their filter-feeding mechanism and oxygen exchange. They allow water to enter the sponge, carrying food particles and oxygen while removing waste and carbon dioxide. The presence of pores ensures the sponge's survival by facilitating its basic biological functions.