Answer: not sure if this will help you but in my opinion, I think certain Topics and themes stay relevant because people will talk about some popular topics, while other topics will almost never be talked about.
Explanation:
I’m rlly sorry if this didn’t help :(
Answer:
i think this is correct
sorry if its isnt
adjective
the noun is "the data" and "that he could gather" is describing the data (the noun) so it is an adjective