2. Ostia VS Osculum

Ostia and osculum are two anatomical features found in certain animals, particularly sponges.

1. Ostia:
   - Ostia (singular: ostium) are small, numerous pores or openings in the body of a sponge.
   - They are typically located on the outer surface of the sponge.
   - Ostia are responsible for drawing water into the sponge, allowing it to filter and obtain nutrients from the water.

2. Oscula:
   - The osculum (singular: osculum) is a larger, usually single opening found in sponges.
   - It is situated at the top or upper part of the sponge.
   - The primary function of the osculum is to expel the filtered water, along with waste and other unwanted materials, back into the surrounding environment.

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