Read the paragraph. An engineer named Elijah McCoy invented the "oiling cup" which kept trains and steamboats oiled when they were moving. The use of the
oiling cup became known as the "McCoy system." When people say "It's the real McCoy," they mean it has what it takes to make something work
perfectly.
Which words best describe the author's purpose?
O 1. to inform
2. to persuade
O 3. to inspire
O 4. to entertain

1. To Inform

Explanation:

We know the author's purpose is to inform because they're explaining to the reader what the phrase "It's the real McCoy" means and the backstory/origins behind it.

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.