Vestigial usually refers to traits which over evolution have lost their main function and are less useful than they once were.
In number one Hunter means that he thinks the teeth were from the ancestor whale shark but are now useless or nearly useless to the current whale shark.
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Free writing is a tool that many writers use to combat writer's block. The process of free writing liberates you from expectations, opens up space for creativity and allows you to download all of the thoughts
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Explanation:
one main idea that gets built on by the supporting sentences