Define species-area relationship. What is the significance of the slope of regression ? Show with the help of a graph .

Explanation

### Step-by-Step Solution

1. **Definition of Species-Area Relationship**:
The species-area relationship is a principle that describes how the number of species (species richness) in a given area increases with the area size. This concept was introduced by the German naturalist and geographer Alexander von Humboldt. He proposed that as the area explored increases, the richness of species also increases, but only up to a certain limit.

2. **Graphical Representation**:
To illustrate the species-area relationship, we can create a graph:
- **X-axis**: Represents the area (A).
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