Tetanus is caused by ______bacteria.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Disease**: Tetanus is an infectious disease characterized by muscle stiffness and spasms, particularly affecting the jaw, leading to a condition known as "lockjaw."

2. **Identifying the Causative Agent**: Tetanus is caused by a specific type of bacteria. To identify this bacteria, we need to consider the characteristics of the disease.

3. **Environmental Presence**: The bacteria responsible for tetanus are known to be present in various environments, including soil, dust, and manure. This suggests that they are commonly found in the environment.

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