Evolution of various forms of life is known as

Options

A. Chemogeny
B. Biogeny
C. Both (1) and (2)
D. Cognogeny

Answer

To solve the question "Evolution of various forms of life is known as," we need to analyze the options provided and understand the terms related to the evolution of life.

### Step-by-Step Solution:

1. **Understanding the Options**: The options given are:
- A) Chemogeny
- B) Biogeny
- C) Both 1 and 2
- D) Cognogeny

2. **Defining Chemogeny**:
- Chemogeny refers to the chemical evolution of life. It is the process that explains how different essential chemicals for life (like amino acids and nucleotides) formed on Earth. This is the first step in the origin of life.

3. **Defining Biogeny**:
- Biogeny refers to the origin of the first living cells. It includes the processes that led to the formation of the first cellular life forms, such as protobionts and eobionts.

4. **Defining Cognogeny**:
- Cognogeny refers to the evolution and diversification of various life forms on Earth. It encompasses the evolutionary processes that lead to the variety of species we see today.

5. **Identifying the Correct Term**:
- The question specifically asks for the term that describes the evolution of various forms of life. Based on the definitions:
- Chemogeny deals with the formation of chemicals.
- Biogeny deals with the formation of the first cells.
- Cognogeny deals with the evolution and diversification of various life forms.

6. **Conclusion**:
- Therefore, the correct answer to the question "Evolution of various forms of life is known as" is **Cognogeny** (Option D).

### Final Answer:
**D) Cognogeny**