In the blood clotting cascade mechanism, which specific enzyme catalyzes the conversion of fibrinogen to fibrin

In the blood clotting cascade mechanism, thrombin catalyzes the conversion of fibrinogen to fibrin. Thrombin is the main enzyme of hemostasis, which is how we stop bleeding. Thrombin also triggers platelets, controls endothelial cell function, and has a mass of direct actions on other cells.

the calvin cycle has three stages. in stage 1, the enzyme rubisco incorporates carbon dioxide into an organic molecule. in stage 2, the organic molecule is reduced. in stage 3, rubp, the molecule that starts the cycle, is regenerated so that the cycle can continue

it's c. (to reduce the greenhouse effect/carbon gasses)