Question

the portuguese man - of - war is not a true jellyfish. what is it actually?
a coral polyp
a worm colony
a type of medusa
a hydra

Explanation:

The Portuguese Man - of - War is a siphonophore. Siphonophores are in the class Hydrozoa. Hydrozoans have two main body forms: the polyp and the medusa. The Portuguese Man - of - War is a type of medusa. Coral polyps are in a different class (Anthozoa). A worm colony is completely unrelated as it belongs to a different phylum (Annelida if we consider common worms). Hydra is a simple freshwater hydrozoan but the Portuguese Man - of - War is a more complex colonial medusa - like siphonophore.

Answer:

A type of medusa