The sentence should instead be this: Which moves more swiftly through the water, a shark or a crocodile. Although this is starting to slip from common usage.
what would your pitch be? Doctors save lives, farmers pervades goods.
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Can you pls put the options in a comment below so I can help
The authors purpose is the main idea of the story. What is the story focused on? What is the main topic that is being discussed over and over again. Main ideas are usually at the beggining and end of paragraphs/stories! hope this helped!!!