Final answer:
True. Erythrocytes have an average life span of 120 days in circulation and are removed by macrophages.
Step-by-step explanation:
True. Erythrocytes, or red blood cells, have an average life span of 120 days in circulation. After this time, they are removed by macrophages in the bone marrow, liver, and spleen. The components of the degraded erythrocytes' hemoglobin are further processed for recycling.