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a group of two or more atoms that form the smallest identifiable unit through chemical bonds

A. atom

B. element

C. compound

D. molecule

. Why does the author compare space exploration to the Lewis and Clark journey?

A. to describe how the explorations were different

B. to give an example of earlier space explorations

C. to show that explorations are dangerous

D. to demonstrate the idea that space exploration brings opportunities

What does she _____________ to watch?

A. wants

B. want

C. doesn’t want

D. don’t want

When we arrived, she ___ for over an hour.

A. had been waiting

B. was waiting

C. waited

D. has been waiting