You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Given a scientific question, generate a correct answer to it.

Who proposed the theory of evolution by natural selection?
Solution: darwin
Why? This is a direct fact that Charles Darwin proposed the theory of evolution.

New input: Newly formed what aggregates into threads that form the framework of the clot?
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
fibrin