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1. What is the primary function of the respiratory system?
A. Breathing B. Circulation
C. Digestion D. Movement
2. What human body system is responsible for the distribution of food nutrients and oxyger
throughout the body?
A. Circulatory B. Nervous C. Respiratory
D. Skeletal
3. What type of blood cell protects your body from infection due to disease causing
microorganisms?

A. Plasma


B. Platelets


C. Red blood cell


D. White blood cell.