The answer is D given that both arguements account for a large mass in the center of the swirling gas :)
Answer:
Asingle drop of water-ust ordinary pond water-has hundreds of microscopic animals living in it
Explanation:
A run-on sentence happens when more than one complete sentences are not lined correctly, and sometimes without punctuation.
Therefore, the sentence from the given options that is a run-on sentence is option C and this is because it satisfies the above given conditions
