Based on the source of their nutrition or food, organism occupy a specific place in the food chain that is known as their

Options

A. Trophic level
B. Standing state
C. Food web
D. Stratification

Answer

To solve the question, we need to identify the term that describes the specific place an organism occupies in a food chain based on its source of nutrition.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a term that describes the specific position of an organism in a food chain based on how it obtains its nutrition.

2. **Analyzing the Options**:
- **A. Trophic Level**: This term refers to the position an organism occupies in a food chain, which is determined by its feeding relationships. For example, producers (like plants) are at the first trophic level, primary consumers (like herbivores) at the second, and so on.
- **B. Standing State**: This term does not specifically relate to the position in a food chain; rather, it refers to the biomass present in an ecosystem at a given time.
- **C. Food Web**: This term describes a complex network of interconnected food chains within an ecosystem, but it does not refer to the position of a single organism.
- **D. Stratification**: This term refers to the layering of different species in an ecosystem, such as the layers of trees in a forest, and is not related to the food chain.

3. **Identifying the Correct Answer**: Based on the definitions and the context of the question, the term that best fits the description of an organism's position in a food chain based on its nutrition source is **A. Trophic Level**.

### Final Answer:
The correct answer is **A. Trophic Level**.