The first sentence. When you're talking about more than one elf it is elves not elfs.
He was happy and felt lonely because he had no one to show. He called the fire his friend.
Are these meant to be titles of something (a book, movie, etc)? If so, then they should either be in quotation marks or in italics.
Waterfall, I think
Keeps going
Answer:
Copy everything below :)
Explanation:
This process is called echolocation. The only animals that use this unique sense ability are certain mammals bats, dolphins, porpoises, and toothed whales. It now is believed that these animals use sound to "see" objects in equal or greater detail than humans
