Define two measures of species diversity.

Explanation

**Step-by-Step Solution:**

1. **Understanding Species Diversity**:
- Species diversity refers to the variety of different species within a specific community or ecosystem. It includes both the number of different species (species richness) and the number of individuals of each species.

2. **Measure 1: Species Richness**:
- Species richness is the first measure of species diversity. It is defined as the count of different species present in a particular area.
- This measure focuses solely on the number of species, without considering the abundance of each species.
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