your answer would be C. basophils
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.
Species is a group of living organisms consisting of similar individuals capable of exchanging genes.
Hope it helps yah (◕ᴗ◕✿)
A nervous system because worms don't have nerves