Its when you dont add commas , periods etc..
example --- the kid went out and play with his friends and he also forgot to come home on time he got in trouble and he cant do anything.
there is many commas missing that is a run on.
Ok whahanannajakakksjsn me hahke
D is the only sentence with the correct usage of quotation marks.
Answer: abuse, a waste of time, animal endangerment, it affects the earth
Explanation: Animal experiments prolong the suffering of humans waiting for effective cures because the results mislead experimenters and squander precious money, time, and other resources that could be spent on human-relevant research. Animal experiments are so worthless that up to half of them are never even published
He was brought then gradually back to his old ideas. Greek like struggles would be no more. Men were better, or more timid.
It celebrates military might.