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Answer:planetarium projector is?

O commas that set off a parenthetical phrase

O use of the signal word "is"

o the inclusion of an example

o the inclusion of a synonym

Explanation: the first one

The word “Planet” in planetarium allows you to connect the idea that it has something to do with planets and space

“Tarium” is a suffix that indicating a place for or associated with something so you can assume that a Planetarium is a place or a thing that is associated with planets.

A projector is something that projects images

With all of the following in mind you can understand that a Planetarium projector probably projects planets.
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