A substance that activates plasminogen might be useful to:

a. Cause clot dissolution to proceed faster.
b. Cause clots to form faster.
c. Recruit neutrophils to an infection.
d. Recruit platelets to the area. initiate clot formation.

Option A.

Cause clot dissolution to proceed faster.

Explanation:

Plasminogen activator is a substance that activates plasminogen to plasmin. Plasminogen activator is a serine proteases which catalyze the activation of plasminogen. The damaged blood tissue releases tissue plasminogen. The plasmin is important to break fibrin polymers that is formed during clotting of the blood. Increased plasminogen levels cause blood clots to dissolve faster.

In biology , A population is all the organisms of the same group or spices , which live in a particular  geographical area , and have the capability in interbreeding .