Vocabulary N°2 "Simple Animals"

1. Vertebrate: animal with backbone.

2. Invertebrate: animals without a backbone.

3. Symmetry: the balanced arrangement o body parts around a center point or along a center line.

4. Sponge: simple invertebrates tha have pores.

5. Pore: small opening.

6. Stinging- cell animals: animals with stinging cell and hollow, saclike bodies that lack organs.

7. Tentacle: armlike part of a stinging-cell animal.

8. Flatworm: simplest worm with flattened body.

9. Tapeworm: a kind of flatworm with a flattened, ribbonlike body divided into sections.

10. Cyst: a young worm with a protective covering.

11. Planarian: a common freshwater flatworm that is not a parasite.

12. Roundworm: worm that have long bodies with pointed ends.

13. Hookworm: roundworm that is a parasite to humans.

14. Anus: opening through which undigested food leaves the body.

15. Segmented worm: worms with body divided into sections called segments.