It is called the Medusa or the jellyfish. it has no blood, no bones, and no Brain and yet it is a living animal.
Medusae
flatworm. Sometimes they're ugly, sometimes they're cute, but look up a pic!
Polyp
polyp
Medusa
a crazy guy named Steve
Medusa
a crazy guy named Steve
a crazy guy named Steve
Yes, it is a form of the verb "to swim." It is the present tense, third-person singular conjugation (he/she/it swims).
Yes, coral is a cnidarian.
An adult swimming cnidarian is called a medusa.