A glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings in order to prepare a prototype of space colony is

Options

A. glass house
B. phytotron
C. Biosphere 1
D. Biosphere 2

Answer

To solve the question regarding the glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Description**:
- The question describes a structure that is a glass dome covering an area of 3-5 acres.
- It contains 4000 representatives of various ecosystems and is designed to accommodate eight human beings.

2. **Identifying Key Features**:
- The area covered (3-5 acres) is significant and indicates a large-scale project.
- The presence of 4000 representatives of ecosystems suggests a focus on biodiversity.
- The inclusion of human beings implies that this structure is meant for research or habitation.

3. **Analyzing the Options**:
- **Glass House**: Typically used for growing plants, not necessarily for ecosystems or human habitation.
- **Phytotron**: A controlled environment for plant research, but does not encompass a variety of ecosystems or human life.
- **Biosphere 1**: This term is not commonly used in the context of such projects.
- **Biosphere 2**: This is known as an Earth System Science Research Facility that fits the description provided.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Biosphere 2**. It is a facility located in Oracle, Arizona, designed to study ecosystems and human interactions within them.

### Final Answer:
The glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings is known as **Biosphere 2**.

---