A successful parasite is the one which

Options

A. grows rapidly
B. causes severe damage
C. sticks to host for long
D. makes minimum demands from its host

Answer

### Step-by-Step Solution:

1. **Understanding Parasites**: A parasite is an organism that lives on or in a host organism and derives nutrients at the host's expense. This relationship is typically harmful to the host.

2. **Characteristics of a Successful Parasite**:
- **Rapid Growth**: A successful parasite often grows quickly to establish itself in the host.
- **Severe Damage**: While some parasites may cause severe damage, this is not a characteristic of a successful parasite because excessive damage can lead to the host's death, which is detrimental to the parasite's survival.
- **Adherence to Host**: A successful parasite must be able to stick to the host for a prolonged period to continue feeding and reproducing.
- **Minimum Demands**: A successful parasite makes minimal demands on its host. This means it extracts just enough resources without overwhelming the host, allowing it to survive longer.

3. **Conclusion**: Among the characteristics listed, the most crucial aspect of a successful parasite is that it makes minimum demands from its host. This allows the host to remain alive and continue providing resources to the parasite.

4. **Final Answer**: Therefore, the correct answer is that a successful parasite is the one that makes minimum demands from its host.