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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

He often talks to ______________________.

A. himself

B. him

C. hiself

D. he

You _________to me when I told you to turn the oven off.

A. was not listening

B. were not listening

C. are not listening

D. don’t listen