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You will only see a Seed of the website, if you Inspect Source on a website.
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So the table (or seed) is acting sort of as a template for the information added via AJAX?

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Each AJAX call to get the animal sound is nested inside the original AJAX call that gets the list.

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Make sure you return the correct Return type.
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a refers to the request variable name and n is the value

Even though ajax has a strict same domain policy. We can set header information (as the code does in Animalia.php) to allow access from all origins. This is a site talking about this in more depth click here.