Boundaries between one ecosystem and another are indistinct and overlapping therefore all ecosystem on the earth are joined together to form a single global ecosystem known as

Options

A. population
B. Species
C. Biosphere
D. Community

Answer

### Step-by-Step Solution:

1. **Understanding Ecosystems**: Ecosystems are complex networks that include living organisms (biotic components) and their physical environment (abiotic components). Each ecosystem has its own unique characteristics but they often overlap.

2. **Identifying the Question**: The question asks for the term that describes the global network formed by all ecosystems on Earth.

3. **Analyzing the Options**:
- **Population**: This refers to a group of individuals of the same species living in a specific area. This option is incorrect because it does not encompass multiple species or ecosystems.
- **Species**: This is the basic unit of classification, referring to organisms that can reproduce together. This option is also incorrect as it does not represent a collection of ecosystems.
- **Community**: This term refers to a group of different species living together in a particular area. While it includes multiple species, it still does not represent the entirety of ecosystems.
- **Biosphere**: This term refers to the global sum of all ecosystems. It includes all living beings and their relationships with the environment, making it the correct answer.

4. **Conclusion**: The correct term that describes the global ecosystem formed by the interconnection of all ecosystems on Earth is the **Biosphere**.

### Final Answer:
The single global ecosystem formed by all ecosystems on Earth is known as the **Biosphere**.