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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

Comfort __________ more important than pay to me.

A. is

B. are

Paul doesn’t have / needs to travel by bus because he has a car.

A. doesn’t have

B. needs