The kidneys in huuman beings are a part of the system for

Options

A. nutrition
B. respiration
C. excretion
D. transportation

Explanation

**Step-by-Step Solution:**

1. **Identify the Function of Kidneys**: The kidneys are vital organs in the human body, and their primary function is to filter blood and remove waste products.

2. **Evaluate the Options**: The question provides several options: nutrition, respiration, excretion, and transportation. We need to determine which of these functions the kidneys are primarily associated with.

3. **Nutrition**: The first option is nutrition. Nutrition is related to the digestive system, which breaks down food to provide energy and nutrients. The kidneys do not play a direct role in this process.

4. **Respiration**: The second option is respiration. This process occurs primarily in the lungs, where oxygen and carbon dioxide are exchanged. Again, the kidneys are not involved in respiration.

5. **Excretion**: The third option is excretion. This is the process of removing waste products from the body. The kidneys are crucial for this function as they filter out waste from the blood and produce urine, which is excreted from the body.

6. **Transportation**: The fourth option is transportation. While the circulatory system, which includes veins and arteries, is responsible for transporting nutrients and oxygen throughout the body, the kidneys do not have a direct role in this process.

7. **Conclusion**: Based on the evaluation of the options, the correct answer is that the kidneys are part of the system for excretion.

**Final Answer**: The kidneys in human beings are a part of the system for excretion.

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