• A relative clause is a dependent clause that functions as an adjective. It provides information about the noun or pronoun it follows. A relative clause usually begins with a relative pronoun (who, whom, whose, which or that).

You can use a relative clause to combine sentences

ANSWER:

The relative clause should provide information about the noun Skylab.

Skylab which was the first American space station, was launched into orbit around the earth on 14 May 1973.

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