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 all infectious diseases caused by bacteria. Dysentery is primarily caused by bacteria like Shigella, Cholera is caused by Vibrio cholerae, and Typhoid is caused by Salmonella typhi.

2. **Transmission Route**: These diseases are transmitted through the fecal-oral route. This means that the bacteria responsible for these diseases can be spread through contaminated food and water, as well as through direct contact with fecal matter.

3. **Overcrowded Settlements**: In overcrowded human settlements, the population density is high, which often leads to poor sanitation and hygiene conditions. This can include inadequate waste disposal, lack of clean drinking water, and overcrowded living conditions.

...