Niche is

Options

A. the range of temperature that the organism needs to live
B. the physical space where an organism lives
C. all the biological factors in the organism's environment
D. the functional role played by an organism where it lives

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Niche**:
- A niche refers to the role or function of an organism within its environment, including how it interacts with other organisms and its environment. It encompasses the habitat, the resources it uses, and its behaviors.

2. **Analyzing the Options**:
- The question provides multiple-choice options regarding the definition of a niche. We need to evaluate each option to determine which one accurately describes a niche.

3. **Evaluating Option 1**:
- The first option states that a niche is the range of temperature that the organism needs to live. This is incorrect because temperature is a factor of the environment but does not encompass the full definition of a niche.

4. **Evaluating Option 2**:
- The second option describes the physical space where an organism lives, which is known as the habitat. While habitats are related to niches, they are not the same. A habitat is a part of the niche, but it does not define the niche itself.

5. **Evaluating Option 3**:
- The third option refers to all the biological factors in the organism's environment. This is too broad and does not specifically define a niche, which is more about the role and interactions of the organism rather than just biological factors.

6. **Evaluating Option 4**:
- The fourth option states that a niche is the functional role played by an organism where it lives. This accurately captures the essence of a niche, as it includes both the habitat and the interactions of the organism with its environment.

7. **Conclusion**:
- Based on the evaluations, the correct answer is the fourth option, which defines a niche as the functional role played by an organism in its environment.

**Final Answer**: The correct answer is option 4: "the functional role played by an organism where it lives."

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