46. Ostia are meant to a.admit water current b.ingest food c.pass out water current d.excrete waste products
Correct option is A) Ostia are a series of tiny pores all over the body of a sponge that let water into the sponge. The continuous flow leads to the formation of water current. The extra water is expelled out from a large opening known as osculum. Thus, the correct answer is option A.
