The lowest level of organization among following is

Options

A. Biome
B. Ecosystems
C. Populations
D. Communities

Answer

To determine the lowest level of organization among the given options (biome, ecosystem, population, communities), we can analyze each term based on ecological organization.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Biome**: This is the largest level of ecological organization. It encompasses various ecosystems that share similar climate conditions and types of organisms.
- **Ecosystem**: This level includes all the living (biotic) and non-living (abiotic) components in a particular area, interacting with each other.
- **Community**: This refers to a group of different populations (different species) living together in a specific area.
- **Population**: This is a group of individuals of the same species living in a specific area at the same time.

2. **Identify the Hierarchy**:
- The hierarchy of ecological organization from smallest to largest is:
- Species (not listed in options)
- Population
- Community
- Ecosystem
- Biome

3. **Analyze the Options**:
- Among the options provided:
- **Biome** is the highest level.
- **Ecosystem** is below biome.
- **Community** is below ecosystem.
- **Population** is the lowest level among the options provided.

4. **Conclusion**:
- Therefore, the lowest level of organization among the given options (biome, ecosystem, population, communities) is **population**.

### Final Answer:
**Population**