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! :)
The memory of the event would never be forgotten
Answer:
You need to send a ss of the paragraph so I can answer how am I supposed to answer with no paragraph to read so if you really need the answer please ss the paragraph and attach it rq
Explanation:
Everyone enjoyed the celebration
where everyone is indefinite pronoun.
Answer:
grandpa is walking on the stairs very slowly