Why are coral reefs not found in the regions from West Bengal to Andhra Pradesh but are found in Tamil Nadu and on the east coast of India?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Coral Reefs**: Coral reefs are marine structures formed by colonies of coral polyps. They thrive in specific environmental conditions.

2. **Habitat Requirements**: Coral reefs require certain conditions to flourish:
- **Low Siltation**: High levels of sediment can smother corals.
- **Low Freshwater Input**: Coral reefs are sensitive to freshwater, which dilutes the salinity of seawater.
- **High Salinity**: Coral reefs thrive in waters with higher salt content.
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