Which of the following are called key industry animals?

Options

A. Autotrophs
B. Decomposers
C. Herbivores
D. Top carnivores

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Key Industry Animals**:
- Key industry animals are essential for maintaining the balance in an ecosystem. They play a crucial role in the food chain and contribute to the energy flow within the ecosystem.

2. **Identifying Trophic Levels**:
- In an ecological pyramid, there are different trophic levels:
- **Producers** (first level): These are typically plants that produce energy through photosynthesis.
- **Primary Consumers** (second level): These are herbivores that feed on producers. Examples include cows, deer, and goats.
- **Secondary Consumers** (third level): These are carnivores that feed on primary consumers. An example is a frog that eats insects.
- **Omnivores**: These organisms can feed on both primary and secondary consumers, such as humans.

3. **Recognizing the Role of Herbivores**:
- Herbivores are classified as primary consumers. They are called key industry animals because they convert plant products (energy from producers) into animal products. This conversion is vital for the ecosystem as it supports higher trophic levels.

4. **Conclusion**:
- Therefore, the key industry animals are primarily herbivores, as they help maintain the ecosystem by facilitating the transfer of energy from plants to higher trophic levels.

### Final Answer:
Key industry animals are called **herbivores**.

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