Deserts, rain-forest, tundra etc, are examples of

Options

A. community
B. biome
C. ecosystem
D. population

Explanation

To answer the question "Deserts, rain-forest, tundra etc, are examples of," we will analyze the options provided: community, biome, ecosystem, and population.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Community**: A community refers to a group of populations of different species that live in the same geographical area and interact with each other. Examples include all the plants and animals in a forest.
- **Biome**: A biome is a large ecological area on the earth's surface, with flora and fauna (plants and animals) adapting to their environment. Biomes are characterized by their climate, vegetation, and wildlife. Examples include deserts, rainforests, and tundras.
- **Ecosystem**: An ecosystem includes all the living organisms (biotic factors) in a particular area, along with the non-living components (abiotic factors) such as soil, water, and climate, interacting as a system.
- **Population**: A population is a group of individuals of the same species that live in the same area at the same time.

2. **Analyzing the Examples**:
- Deserts, rainforests, and tundras are not communities because they do not refer to interactions among different species in a specific area.
- They are also not ecosystems, as ecosystems involve interactions between biotic and abiotic components, while the terms given refer more to the type of environment rather than the interactions.
- They do not fit the definition of a population, which is specific to a single species.

3. **Identifying the Correct Answer**:
- Since deserts, rainforests, and tundras are large regions characterized by specific types of vegetation and climate, they fit the definition of biomes.
- Therefore, the correct answer to the question is **biome**.

### Final Answer:
Deserts, rain-forest, tundra, etc., are examples of **biomes**.

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