Across
- 4. a non-living factor of the environment
- 6. species not native to Australia
- 9. an introduced species of animal that has become established in the wild
- 12. quick automatic actions that protect the body from danger
- 15. the study of how organisms interact with each other and with their non-living environment
- 16. the brain and spinal cord
- 18. animals that generate body heat internally
- 20. organisms that break down the bodies of dead organisms and animal wastes
- 21. a nerve fibre that sends nerve impulses away from the cell body
- 22. animals that obtain their body heat from outside their body
- 23. the range of different species in a community
- 24. the space between two neurons
- 25. a living factor of the environment
Down
- 1. a sequence of organisms feeding on each other
- 2. connected food chains showing who eats whom in a community
- 3. relationship where one organism kills and eats another organism
- 5. a nerve cell
- 7. branches from the cell body that receive messages from other neurons
- 8. organelles where respiration occurs
- 10. muscles or glands that put the messages into effect
- 11. the nerve pathway operating in a reflect action
- 13. organims that make food for the community
- 14. a chemical message released at the end of an axon to be received by the next neuron's dendrites
- 17. chemical substances that act as messengers in the body
- 19. a specialised cell that detects stimuli