A harmful substance present in land, water or air that pollutes is called ______.

Options

A. Aerosol
B. Pollutants
C. Bioaerosol
D. Particulates

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes a harmful substance present in land, water, or air that causes pollution.

2. **Identifying Key Terms**: The key terms in the question are "harmful substance," "land," "water," "air," and "pollutes."

3. **Defining Pollution**: Pollution is the introduction of harmful substances into the environment, which can occur in various forms such as air pollution, water pollution, and soil pollution.

4. **Identifying the Term for Pollutants**: The substances that cause pollution are referred to as "pollutants."

5. **Conclusion**: Therefore, the answer to the question is that a harmful substance present in land, water, or air that pollutes is called a "pollutant."

**Final Answer**: A harmful substance present in land, water, or air that pollutes is called **pollutant**.

---