Believers of spontaneous generation theory believed that :

Options

A. Life originated from other similar organisms or spontaneously
B. Life originated only spontaneously
C. Life originated from similar organisms
D. Life originated from air

Answer

**Step-by-Step Solution:**

1. **Understanding Spontaneous Generation Theory**: The Spontaneous Generation Theory posits that living organisms can arise from non-living matter without any descent from similar organisms. This theory was historically significant before the development of modern biology and the understanding of reproduction.

2. **Analyzing the Options**:
- **Option 1**: "Life originated from other similar organisms or spontaneously." This option is incorrect because it suggests that life can originate from similar organisms, which contradicts the core idea of spontaneous generation.
- **Option 2**: "Life originated only spontaneously." This option aligns with the belief of spontaneous generation, which states that life arises spontaneously from non-living matter.
- **Option 3**: "Life originated from similar organisms." This option is incorrect as it contradicts the spontaneous generation theory.
- **Option 4**: "Life originated from air." While some proponents of spontaneous generation believed in the role of air, this option is too specific and does not encompass the broader belief that life can arise spontaneously from non-living matter.

3. **Identifying the Correct Answer**: The correct answer is **Option 2**: "Life originated only spontaneously." This option accurately reflects the belief of the proponents of the Spontaneous Generation Theory.

4. **Conclusion**: Therefore, the believers of the Spontaneous Generation Theory believed that life originated spontaneously without any descent from similar organisms.

---