We can see here that according to the footnotes, the National Parks Service explained about the number of different types of vegetation in the passage. B. The National Parks Service.
<h3>What are footnotes?</h3>
Footnotes are actually known to be short notes that are written at the bottom of a page of a book or written academic material which is usually indicated in the main text with superscript numbers, letters or even symbols. Footnotes help in the citation used in the text. The numbers or letters used as superscripts are usually placed at the end of the clause or sentence.
We see that the above selected answer reveals who actually explained the number of different types of vegetation seen.