<span>Because the information about Thurgood Marshall features his timeline and the desegregation cases themselves aren't necessarily "general knowledge" because although someone may be familiar with Marshall's name, they won't necessarily be familiar with the specific contributions, this fact would need citation.</span>
The correct answer is present progressive.
It means that there is some progression, that something is going on at the moment when this sentence is taking place. So, they are currently climbing to the top of the Aztec temple.
Present emphatic would be 'they do climb,' basic present would be 'they climb,' and present perfect would be 'they have climbed.'
I'm pretty sure the answer is "claim"
Answer: It was a blueprint for methods of nonviolent protest .
