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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.
“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.