Given a scientific question, generate a correct answer to it.
--------
Question: All combustion reactions are what type of reactions?

Answer: exothermic


Question: Space telescopes avoid such problems completely since they orbit outside the what?

Answer: atmosphere


Question: Platelets play a role in what cascade of reactions that converts plasma fibrinogen to fibrin?

Answer:

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
blood clotting


