Answer:
the answer is A
Explanation:
because they wanted to to develop more efficient ways to travel and wanted to expand their power in the world
They might have gathered data through structures for viewing sky events. They might have had a cultural importance.
Answer: B: earths magnetic field protects it from all types of space weather
Explanation: There is no text provided but this is the one that seems like it would be a good summary compared to the other answers.
B would be your best option because it explains the text more.
A comma indicates a pause between the ending of an introductory word, phrase, or clause, and the beginning of the main part of the sentence.
# A comma is used before any coordinating conjunction (and, but, for, or, nor, so, yet) that links two independent clauses. ....
#It is also used after a dependent clause that starts a sentence. ...
#Commas also used to offset appositives from the rest of the sentence. ...
#They are used to separate items in a series. (this is the most commonly used)
