Diseases like dysentery, cholera, typhoid, etc., are more common in over crowded human settlements . Why ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Diseases**:
- Dysentery, cholera, and typhoid are primarily waterborne diseases. Dysentery involves inflammation of the intestines and results in severe diarrhea, often with blood. Cholera is caused by the bacterium *Vibrio cholerae* and leads to severe diarrhea and dehydration. Typhoid fever is caused by contamination of food and water.

2. **Role of Contamination**:
- These diseases are linked to the contamination of water sources. In overcrowded human settlements, the risk of water contamination increases due to inadequate sanitation and hygiene practices. This can lead to the spread of pathogens that cause these diseases.

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