Which of the following is not correclty paired

Options

A. Mesozoic- Age of mammals
B. Study of fossils- Palaeontology
C. Mutation theofy - Hugo de Vries.
D. Origin of Speices- Charles Darwin

Answer

To determine which of the following options is not correctly paired, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- Mesozoic - Age of Mammals
- Study of Fossils - Palaeontology
- Mutation Theory - Hugo de Vries
- Origin of the Species - Charles Darwin

2. **Analyze Each Pair**:
- **Mesozoic - Age of Mammals**: This is incorrect. The Mesozoic era is known as the age of reptiles, not mammals. The age of mammals is referred to as the Cenozoic era.
- **Study of Fossils - Palaeontology**: This is correct. Palaeontology is indeed the study of fossils.
- **Mutation Theory - Hugo de Vries**: This is correct. Hugo de Vries is known for proposing the mutation theory.
- **Origin of the Species - Charles Darwin**: This is correct. Charles Darwin is the author of "On the Origin of Species."

3. **Conclusion**: Since the only incorrect pairing is the first one (Mesozoic - Age of Mammals), the answer to the question is that this option is not correctly paired.

### Final Answer:
The option that is not correctly paired is: **Mesozoic - Age of Mammals**.

---