When a wound occurs in humans, the platelets in the blood activate a substance which starts the clotting process. The substance which starts the clotting is: a) adenosine (pron: ah-den-ah-seen) b) histamine c) lecithin (pron: less-ah-thin) d) thrombin
option D. When a wound happens in people the platelets withinside the blood spark off a substance Thrombin begins offevolved the clotting process.
