Question

Which of the following types of skeletal material is NOT found in at least some sponges?

Select one:
a. spongin
b. muscle
c. calcium carbonate
d. spicules
e. silica

Answer 1

Muscle is not found in some sponges I've spent the last hour doing reserch on sponges for school and haven't seen many with muscle.

Answer 2

b. muscle

Step-by-step explanation:

The Sponges usually known as Porifera (pore bearers) are aquatic filter feeders. The sponges consist of structural materials (spongin, spicules) which are usually made of calcium carbonate and/or silica. These structures forms their skeletal materials giving their body a thin sheet of cells over a frame (skeleton). As invetebrate and at the unicellular level of organization, Sponges lack muscle.