Restorative regeneration decrease with

Options

A. Increase in complexity of organisation
B. Decrease in organisational complexity
C. Development of hormones
D. Development of nerves

Answer

### Step-by-Step Solution:

1. **Understanding Restorative Regeneration**:
- Restorative regeneration refers to the process by which organisms can regrow or repair lost body parts due to injury or accidents. This process is crucial for the survival and recovery of many species.

2. **Analyzing the Factors Affecting Regeneration**:
- The capacity for restorative regeneration is influenced by the complexity of the organism’s body structure. Generally, simpler organisms have a higher capacity for regeneration compared to more complex organisms.

3. **Evaluating the Options**:
- **Option 1: Increase in complexity of organization**:
- As the complexity of an organism increases, its ability to regenerate decreases. This is because more complex organisms have specialized cells and tissues that do not readily revert to a regenerative state.
- **Option 2: Decrease in organizational complexity**:
- A decrease in complexity would lead to an increase in regenerative capacity, as simpler organisms can regenerate more effectively.
- **Option 3: Development of hormones**:
- While hormones play various roles in growth and development, they are not directly responsible for the regenerative capacity of an organism.
- **Option 4: Development of nerves**:
- Similar to hormones, the development of nerves does not significantly affect the restorative regeneration process.

4. **Conclusion**:
- Based on the analysis, the correct answer is that restorative regeneration decreases with an increase in the complexity of organization.

### Final Answer:
Restorative regeneration decreases with an increase in complexity of organization.