Which of the following are called key industry animals?

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which group of animals is referred to as "key industry animals."

2. **Identifying the Options**: The options provided are:
- Autotrophs
- Decomposers
- Herbivores
- Top Carnivores

3. **Defining Each Group**:
- **Autotrophs**: These are organisms that produce their own food, primarily plants.
- **Decomposers**: These organisms break down dead organic material and recycle nutrients back into the ecosystem.
- **Herbivores**: These are primary consumers that feed on plants.
- **Top Carnivores**: These are predators at the top of the food chain that feed on other animals.

4. **Analyzing the Role of Each Group**:
- **Autotrophs** are crucial for producing energy in the ecosystem but are not animals.
- **Decomposers** play an essential role in nutrient cycling but are not considered key industry animals.
- **Herbivores** convert plant matter into animal matter, making them essential for transferring energy from plants to higher trophic levels.
- **Top Carnivores** depend on other animals for food and do not directly contribute to the energy transfer from plants.

5. **Conclusion**: Based on the analysis, herbivores are considered "key industry animals" because they are primary consumers that convert plant matter into animal matter, facilitating energy transfer in the ecosystem.

### Final Answer:
The correct answer is **Herbivores**.