Question

observe the encrusting sponge which was growing under the rock picked up from the shore at paradise beach.note the several excurrent vents (osculum/oscula)touch gentlly with your hands .how does it feel to touch?

Answer 1

The osculum (plural "oscula") is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel. Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes.

Answer 2

Answer:

Feel when you put slowly your fingers on dark hole how you feel.