Known for their intelligence and playful behavior, dolphins are highly social animals. Sponges (Porifera) Sponges are simple ...

There are over 9,000 described species of sponge (Porifera) living in the ocean, from the intertidal zone all the way down to the abyss. These animals have long been providing for their underwater ...

Sponges are sessile animals within the phylum Porifera. There are over 9,000 known species of sponge living in all parts of Earth's oceans, but estimates suggest that there could be as many as 25,000 ...

For example, calcite and aragonite are polymorphs of calcium carbonate. Porifera ("sponges") - A sponge has a system of holes and canals the animal uses to circulate water through its body. Sponges ...

This story appears in the June 2011 issue of National Geographic magazine. The sea star—often called a starfish, though it's no more a fish than it is a sheepdog—ranks with the most ...

Hill would also become the first president of the International Association for the study of Fossil Cnidaria and Porifera.