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For question 28:
The function of the subordinate clause "because Edwin Hubble's work proved that the universe was expanding" is to demonstrate a cause. In this case, the cause (Edwin Hubble's work proving the universe was expanding) leads to the effect (astronomers being able to determine the age of the universe). Therefore, the correct answer is B. It demonstrates a cause.
For question 29:
A simple sentence consists of one independent clause and no dependent clauses. Looking at the sentences provided:
A. "Atlas is the name of a moon that revolves around Saturn." - This sentence has one independent clause, so it is a simple sentence.
B. "Atlas is one of Saturn's moons and is named after a Titan." - This sentence has two independent clauses joined by "and," making it a compound sentence, not a simple sentence.
C. "Atlas is a moon of Saturn, and it is named after a Titan." - Similar to sentence B, this is a compound sentence due to having two independent clauses.
D. "Atlas is the name of a moon, which revolves around Saturn." - This sentence contains a dependent clause ("which revolves around Saturn"), so it is not a simple sentence.
Therefore, the simple sentence is A. "Atlas is the name of a moon that revolves around Saturn."
I hope this explanation helps you understand the functions of subordinate clauses and how to identify simple sentences. Let me know if you have any more questions!
