A dozen eggs are in the box or a dozen eggs is in the box
are
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There are two sizes of egg cartons.
A dozen eggs are in the large one, and a half-dozen eggs are in the small one.
In that sentence, dozen is a determiner, modifying "eggs." The plural "eggs" matches "are."
Dozen can be used as a collective noun. Collective nouns name groups of people or items. If the group is seen as identic