How are open drains harmful for human health?

Explanation

**Step-by-Step Solution:**

1. **Introduction to Open Drains**: Open drains are channels that carry wastewater and sewage without any cover. They are often found in urban areas where proper sewage systems are lacking.

2. **Source of Pollution**: The waste produced in open drains primarily comes from human activities. This includes food waste, garbage, and other pollutants that are not disposed of properly.

3. **Environmental Impact**: Open drains contribute to environmental pollution. They emit foul odors and create unsightly conditions that can lead to a dirty environment.

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