Answer:
Yes, it is a compound sentence
Explanation:
Explanation:
Scientists are able to learn about the past conditions of Earth's atmosphere through direct chemical records and proxies of chemical records. The study of Earth's past climate is called paleoclimatology. Polar ice cores are the only direct chemical records that exist on Earth.
Answer: c. looked / was searching
Explanation:
<em>When I first got off the plane, I </em><em><u>looked</u></em><em> around as if in a fog. I </em><em><u>was searching</u></em><em> for my classmates. </em>
The sentence started with the past tense being used by the narrator. As such, the rest of the narration has to be in past tense as well.
With this in mind, the word <em>looked</em> and the phrase <em>was searching</em> would be the right words to use to fill in the blanks.