The maintenance of internal conditions of an organism within a certain boundary range is called :

Options

A. evolution
B. metabolism
C. adaptation
D. homeostasis

Explanation

To solve the question about the maintenance of internal conditions of an organism within a certain boundary range, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the term that describes the maintenance of internal conditions within a certain range in organisms.

2. **Identify the Options**: The options provided are:
- A) Evolution
- B) Metabolism
- C) Adaptation
- D) Homeostasis

3. **Analyze Each Option**:
- **Evolution**: This refers to the change in the genetic composition of a population over time and does not relate to internal conditions.
- **Metabolism**: This involves all chemical reactions that occur within an organism, but it does not specifically refer to the maintenance of internal conditions.
- **Adaptation**: This is the process by which organisms adjust to their environment, but it does not specifically refer to maintaining internal conditions.
- **Homeostasis**: This is the process by which organisms maintain a stable internal environment despite changes in external conditions.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **Homeostasis** (Option D).

5. **Further Explanation**: Homeostasis involves various physiological processes that help regulate factors such as temperature, pH, hydration, and electrolyte balance, allowing organisms to function optimally.

### Final Answer:
The maintenance of internal conditions of an organism within a certain boundary range is called **Homeostasis**.

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