What kind of class do you never have to attend, but always seems to be in session?

Category: Wordplay · Difficulty: hard

Hint: Consider the aquatic world.

Answer

A class of fish

Explanation

The term 'class' in biology refers to a group of organisms, playing on the double meaning.

This is a hard wordplay riddle — a tricky one that takes a little thought. The answer is A class of fish.

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