It helps them stay on the water standing up
It helps them stay on the water standing up
Skeleton made up of spicule supports most sponges .
Silica.
Collagen
spongin!
Sponges don't have skeletons! They are invertebrates which means the creature doesn't have a backbone, but in this case, it doesn't have a skeleton! (I think this is right, I apologize if it isn't)
Although sponges do not have a skeletal system they do have skeleton components that may be made of silicon or lime. A sponge is found in the ocean and is a hollow tube that has several large pores throughout it.
spongin is the soft material that makes up a sponge´s skeleton and spicule provides support for the sponge.
Sponges get food from the water around them.
The three classes of sponge skeletons are siliceous or glass sponges (Class Hexactinellida), calcareous sponges (Class Calcarea), and sponges with a fibrous protein skeleton (Class Demospongiae). Each class has unique structural characteristics that support the sponge's body.
Sponges
The spike forms a rigid frame that helps support and protect the sponges body.