Matching blood components to their functions

Steps:

• Identify labelled parts in the photomicrograph: 1 as red blood cell, 2 as white blood cell, 3 as platelet.
• Recall primary functions: red blood cells transport oxygen, white blood cells defend against pathogens, platelets aid clotting.
• Compare to table rows: functions listed as oxygen transport, clotting, pathogen defense.
• Select row matching label order: 1 (oxygen), 3 (clotting), 2 (defense).

Why A is correct:

• Assigns oxygen transport to 1 (red blood cell), clotting to 3 (platelet), and pathogen defense to 2 (white blood cell), aligning with biological roles.

Why the others are wrong:

• B: Assigns pathogen defense to 1, but 1 is red blood cell, not involved in immunity.
• C: Assigns oxygen transport to 3, but 3 is platelet, which does not carry oxygen.
• D: Duplicate of C, misassigning functions to incorrect components.

Final answer: A