*Q:18 Correct Answer* ✅ *(4) A is false but R is true* > *Explanation:* Not all flatworms have hooks and suckers — only parasitic flatworms (like Taenia and Fasciola) possess these structures as adaptations for attachment inside the host. Free-living flatworms (like Planaria) lack hooks and suckers. However, the Reason is true — hooks and suckers are indeed parasitic adaptations in flatworms.