Across
- 2. plants that do not contain chlorophyll
- 3. animals that breathe using gills
- 4. a small green plant with leaves but without a stem
- 8. these animals have a scaly skin
- 9. animals with backbones
- 11. green plants with leaves and roots but no seeds
Down
- 1. these plants have seeds in cones
- 5. a way of classifying objects
- 6. to sort out living things into groups
- 7. animals that have a constant body temperature
- 10. the study of living things