The answer to your question is A or true.
Blood clots form when platelets and plasma proteins thicken to form a sort of solid mass. They can form from an injury, blood flowing slowly through your system, or even for no obvious reason.
Th earth scientists have improved our understanding with the environment because of their studies in which they had shown better understanding and explanation of occurrences with the means of having to provide not only explanation nor visuals but also providing proof of these mere existence that made people believe and understand the environment.
