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.
A calcareous sponge is any of a variety of sponge of the class Calcarea, with skeletons composed of spicules of calcium carbonate.
No sponges have skeletons.
sea wom
Six primary classes, three intermediate classes (Junior High) Three Senior classes.
Sponge painting is a fun technique to use. You need paint a pan and a sponge. All you do is dip the sponge in the paint then apply to the wall where ever you want the sponge effect to be. It is very fun for kids also.
cartilage
The three vertebrate classes of fish are: Agnatha (jawless fish without scales, e.g. lampreys and hagfish)Chondrichthyes (sharks and rays, which have skeletons of cartilage rather than bone)Osteichthyes (all the bony fish e.g. tuna, trout, whiting, etc.)
to what three classes in diagram does vinegar belong
Animals can have three types of skeletons: hydrostatic, exoskeleton, and endoskeleton. Hydrostatic skeletons are made of fluid-filled compartments that provide support, like in earthworms; exoskeletons are hard external coverings, like in insects; and endoskeletons are internal structures made of bone or cartilage, like in mammals.
There are eight possible phenotypic classes that can be generated from a three-point testcross: two parental classes and six recombinant classes.
The three major classes of cnidarians are hydrozoans, jellyfish, and sea anemones and corals.
There were deaths in all three classes and the crew.