Books that are surrounded by oxygen will turn yellow, so basically, all books since oxygen is constantly surrounding us. Oxygen-rich conditions are very bad for paper, which gives them the yellow tiny. This is actually called lignin oxidation! Lignin oxidation gives it a yellow or brown colour as you said. Yellow comes first, then brown after.
I hope this helped a bit! :)
<span>D) The author is speculating, but not providing concrete evidence.
Hope this Helps!</span><span>(￣ω￣)
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Answer:
verb
Explanation:
To prepay something, you have to pay beforehand/in advance.
