Question

1. what class of cnidarians is a portuguese man of war?

hydrozoa
anthozoa
calcarea
scyphozoa

Explanation:

The Portuguese Man of War (Physalia physalis) is a colonial hydrozoan. Hydrozoa is a class of Cnidarians that includes many colonial and solitary forms, and the Portuguese Man of War fits into this class. Anthozoa includes corals and sea anemones (sessile, polyp - dominant), Calcarea is a class of sponges (not Cnidarians), and Scyphozoa includes true jellyfish (usually free - swimming medusa - dominant).

Answer:

A. Hydrozoa