Your answer is probably C.
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! :)
Answer:
Exercise can help you live longer, it can prevent diseases, exercise can prevent you from breaking a bone because your muscle protect your bones and the muscle is strong.
Explanation:
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Answer:
Informal definition
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