Across
- 2. Living things can ____________ to produce offsprings
- 4. Ferns do not produce seeds. They reproduce by releasing these.
- 8. A _________ plant has vascular tissues
- 10. Animals without a backbone
- 11. Animals with a backbone
- 12. For flowering plants, their seeds are protected in these.
Down
- 1. They (adults) breathe with lungs and skin
- 3. Mammals and birds can a ___________ body temperature
- 5. Living things in danger of extinction are called _____ species
- 6. Fish use these for breathing
- 7. Mammals have __________ glands
- 9. Animals with dry, hard scales