Question

pathogens are ______.
○ organisms that protect the body against invaders
○ tiny organisms that try to damage cells
○ a type of white blood cell
○ hormones that guide the immune system response

Explanation:

To solve this, we analyze each option:

• Option 1: Organisms that protect the body are part of the immune system (like white blood cells), not pathogens. So this is incorrect.
• Option 2: Pathogens are defined as tiny organisms (like bacteria, viruses, fungi) that can invade the body and try to damage cells/tissues. This matches the definition.
• Option 3: White blood cells are part of the immune system that fights pathogens, not pathogens themselves. Incorrect.
• Option 4: Hormones guiding immune response are signaling molecules, not pathogens. Incorrect.

Answer:

B. tiny organisms that try to damage cells (assuming the second option is labeled B; if the original labels were different, adjust the identifier, but based on the options, the correct one is "tiny organisms that try to damage cells")