Tets C: Critical Thinking
1. Astronomer: Most stars are born in groups of thousands, each star in
a group forming from the same parent cloud of gas. Each cloud has a
unique, homogeneous chemical composition. Therefore, whenever two
stars have the same chemical composition as each other, they must have
originated from the same cloud of gas.
Which of the following, if true, would most strengthen the astronomer’s
argument?
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