Select the correct match from the following.

Options

A. Adaptive radiation : Australian marsupials
B. Origin of Earth : 20 billion years age
C. Most acceptable theory of origin of life Neo - Darwinism
D. Panspermia : Life evolved from pre-existing chemicals

Answer

To solve the question "Select the correct match from the following," we will analyze each option provided and determine which one is correct.

### Step 1: Analyze the first option
- **Adaptive radiation and Australian marsupials**:
- Adaptive radiation refers to the process by which organisms diversify rapidly into a variety of forms to adapt to different environments. Australian marsupials, such as kangaroos and koalas, are a classic example of adaptive radiation as they have evolved to occupy various ecological niches in Australia.
- **Conclusion**: This match is correct.

### Step 2: Analyze the second option
- **Origin of earth is 20 billion year age**:
- The current scientific consensus is that the Earth is approximately 4.5 billion years old, not 20 billion years. This option is incorrect.
- **Conclusion**: This match is incorrect.

### Step 3: Analyze the third option
- **Most adaptable theory of origin of life is neo-dualism**:
- Neo-dualism is not recognized as the most adaptable theory of the origin of life. The most widely accepted theories include abiogenesis and panspermia, but neo-dualism is not a prominent theory in this context.
- **Conclusion**: This match is incorrect.

### Step 4: Analyze the fourth option
- **Panspermia, which is matched with a life evolved from a pre-existing chemical**:
- Panspermia is the hypothesis that life exists throughout the universe and is distributed by meteoroids, asteroids, comets, and planetoids. It does not specifically state that life evolved from a pre-existing chemical but rather suggests that life could have originated elsewhere and been transported to Earth.
- **Conclusion**: This match is incorrect.

### Final Conclusion
After analyzing all the options, the only correct match is:
- **Adaptive radiation and Australian marsupials**.

Thus, the correct answer is the first option.