Has 2 cell layers
Sponges protect themselves with spikes in their body.
Sponges
nooo.
Ostia
sponges have no cells which means no tissues and that means no organs because of what the cycle is there would not be any organs in the body of a sponge
It has two cell layers.
Sponges have no proper body cavity or coelom. However, in the everyday sense of the expression, there is a cavity inside sponges, which is called a spongocoel.
spongin and spicules are the sponges body support and defence
bone marrow
an asymmetrical body plan
Everything that a human body has. Guessing?!
sponges let the water enter through the canal and circulates all over the body.