There was no life in which era :

Options

A. Mesozoic era
B. Palaeozoic era
C. Cenozoic era
D. Azoic era

Answer

### Step-by-Step Solution:

1. **Understanding the Eras**:
- There are four main geological eras: Mesozoic, Paleozoic, Cenozoic, and Azoic. Each era is characterized by different life forms and geological events.

2. **Mesozoic Era**:
- Known as the era of medieval life, it is characterized by the presence of dinosaurs and gymnosperms. This era is approximately 225 million years old.

3. **Paleozoic Era**:
- Referred to as the era of ancient life, it includes the emergence of amphibians, jawless fishes, and reptiles. This era is divided into six periods and is significant for the evolution of many life forms.

4. **Cenozoic Era**:
- Known as the era of modern life, it is characterized by the introduction of Homo sapiens (humans). This era is divided into two periods and represents the most recent geological time.

5. **Azoic Era**:
- This is the oldest era, often referred to as the era of no life. It is characterized by the absence of any life forms. The Azoic era is approximately 4500 million years old and is marked by the presence of the solar system but no biological life.

6. **Conclusion**:
- Based on the descriptions of each era, the era in which there was no life is the **Azoic Era**.

### Final Answer:
The era in which there was no life is the **Azoic Era**.

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