To answer the question "The totality of genes, species, and ecosystems of a region is said to be," we can follow these steps:
### Step-by-Step Solution:
1. **Understanding the Terms**:
- Begin by defining the key terms in the question: genes, species, and ecosystems.
- Genes refer to the hereditary units in living organisms, species are groups of organisms that can interbreed, and ecosystems are communities of living organisms interacting with their environment.
2. **Identifying the Concept**:
- The question is asking for a term that encompasses all these elements (genes, species, ecosystems) within a specific region.
3. **Defining Biodiversity**:
- The term that describes the totality of genes, species, and ecosystems in a region is "biodiversity."
- Biodiversity refers to the variety of life in a particular habitat or ecosystem and includes the diversity of species, genetic variations, and the variety of ecosystems.
4. **Eliminating Other Options**:
- Consider the other terms provided in the question:
- **Biome**: Refers to large ecological areas on the earth's surface, with flora and fauna adapting to their environment.
- **Biotope**: Refers to a specific area of uniform environmental conditions providing a living place for a specific assemblage of plants and animals.
- **Eco species**: Refers to a group of organisms that can interbreed but are not as efficient in doing so compared to species.
5. **Conclusion**:
- After analyzing the definitions, it is clear that the correct answer to the question is "biodiversity," as it encompasses the totality of genes, species, and ecosystems in a region.
### Final Answer:
The totality of genes, species, and ecosystems of a region is said to be **biodiversity**.
