This is a subject pronoun :)
Detail is definitely the key element of descriptive writing
Answer:
"In this case, as many as 20,000 skilled laborers worked to built the pyramids. Tens of thousands of workers required enormous resources…"
Explanation:
I think its 'We had it worse than everyone on the first floor,all the windows in all the upstairs rooms were tinted; and there wasn't enough moonlight in the first place.'