Question

sponges
sponges
0/10
which is the name for the opening in a sponge through which the sponge expels wastes?
a coelom
b osculum
c notochord

Explanation:

• A coelom is a body cavity in higher animals, not a sponge opening.
• An osculum is the large opening in sponges used to expel filtered water and wastes.
• A notochord is a rod-like structure in chordates, unrelated to sponges.

Answer:

b. Osculum