Multiple choice

The kidneys of human beings are a part of the system for

  1. nutrition

  2. transportation

  3. respiration

  4. excretion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kidneys are the primary organs of the excretory system, filtering blood and producing urine to remove metabolic wastes. They are not part of the nutrition system (digestion/absorption), transportation system (circulatory), or respiratory system (gas exchange).

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