Which of the following protects the body against infectious disease and foreign invaders?
Correct answer: A. Leukocytes
- A. Leukocytes
- B. Red blood cells
- C. Endoplasmic reticulum (ER)
- D. Golgi apparatus
Explanation
Leukocytes, or white blood cells, identify and attack pathogens and other foreign materials. Red blood cells mainly transport oxygen, while the endoplasmic reticulum and Golgi apparatus are cell structures rather than immune defenses.
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