Across
- 2. organisms that eat plants
- 4. mammals whose young develop completely inside their mother's body
- 5. is simply known as the give and take relationship
- 6. web an overlapping food chains
- 8. animals that have both male and female reproductive organs
- 9. simplest form of invertebrates
- 11. group of animals where cat belong
- 13. a worm-like larva hatches from the egg
- 14. animals that undergo external fertilization
- 15. refers to the salt content of the water
Down
- 1. occur when species or organisms fight for the same limited sources
- 3. are tiny algae that are carried by waves and currents
- 7. is the union of the sperm cell and the egg cell
- 10. mate by lining side by side
- 12. are mammals with pouches on the abdomen