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2. Possessing both male and female reproductive organs in the same individual.
6. Having separate sexes in a population.
10. Phylum of ribbon worms with elongated, flexible bodies.
14. Phylum of flatworms, including free-living and parasitic species.
17. Elongated feeding structure, often seen in nemerteans for capturing prey.

1. The ability of an organism to regrow lost body parts.
3. Organism that feeds on dead and decaying organic matter.
4. Reproductive organs that produce gametes (sperm and eggs).
5. Phylum of roundworms, with a cylindrical body and a tough cuticle.
7. Contractions: Wave-like muscular contractions used for movement, often seen in nemerteans.
8. A form of asexual reproduction where eggs develop without fertilization.
9. Phylum of segmented worms, including oligochaetes, polychaetes, and leeches.
11. The disturbance of sediments by living organisms, important in nutrient cycling.
12. A method of asexual reproduction where an organism splits into two or more individuals.
13. Internal partitions separating segments in the body of annelids.
15. Parasite that lives on the external surface of its host organism.
16. Protective structure produced by some annelids and leeches for egg deposition.
18. Tiny hair-like structures used for locomotion in flatworms.