Concept:Blood defends the body by clumping disease-causing organisms.Explanation:When harmful organisms enter the blood, antibodies attach to them.This causes the organisms to clump together in a process called agglutination.Clumping weakens the organisms and allows white blood cells to destroy them easily.The other options are not defence mechanisms.Absorption of fatty acids and glycerol is part of digestion.Single circulation describes blood flow in the heart, and translocation is transport in plants.Answer:B. Clumping