What adaptations do phylum porifera have that are unique?

Answer 1

Unique stuctures of Phylum Porifera include

1 : Spicules which may be calcarious or silicious .

2 : Canl system , which may be asconoid , syconoid or leucon type .

3 Spongin fibers in some fresh water sponges .

Answer 2

One of the interesting adaptations in phylum Porifera is that, when it finds that the water circulating through them has more silt and large particles that could block their canal system, it automatically closes its pores and protect themselves!