Relative abundance of different species is known as

Options

A. Species
B. Species evenness
C. Species endemism
D. Genetic diversity

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the relative abundance of different species within a community.

2. **Identifying Components of an Ecosystem**: An ecosystem consists of biotic (living organisms) and abiotic (non-living components) factors. Here, we focus on the biotic components, which include various species of plants and animals.

3. **Defining Relative Abundance**: Relative abundance refers to how common or rare a species is in comparison to other species in a given community. It looks at the population sizes of different species and how they compare to each other.

4. **Introducing Species Evenness**: The term that specifically describes the relative abundance of different species is "species evenness." This concept helps to understand how evenly the individuals of different species are distributed in a community.

5. **Explaining Biodiversity Distribution**: Biodiversity is not uniformly distributed across ecosystems. Some areas may have a rich diversity of species, while others may have fewer. This uneven distribution contributes to the concept of species evenness.

6. **Understanding Ecological Pyramids**: In ecological pyramids, the base represents producers, and as you move up, you find primary consumers and then secondary consumers. The shape of the pyramid illustrates that a larger population of producers is needed to support a smaller population of carnivores, reflecting the concept of species evenness.

7. **Conclusion**: Therefore, the term that describes the relative abundance of different species is "species evenness."

---