Across
- 2. a collection of similar cells in the body
- 3. a cell with a nucleus is _____
- 5. an area occupied by an animal or a group of animals from which other members of the species are excluded
- 6. fixed object an animal uses to find its way
- 8. an organism that eats other organisms
- 11. a period of reduced activity that some animals experience in summer
- 13. special behaviors that an animal uses to find a mate
- 14. a way to send a visual message
- 15. an example of asexual reproduction
- 16. a group of tissues that carry out a special function of the body
- 17. any animal with a backbone
- 18. a behavior that comes from experience or observing other animals
- 22. a period of inactivity that some animals experience in winter
- 23. lions live in groups called _____
- 24. to travel from one place to another in response to the seasons or environmental conditions
Down
- 1. an internal control of natural cycles
- 4. takes place when a signal travels from one animal to another and the receiver of the signal responds
- 7. an animal that is eaten by another animal
- 9. made of many cells
- 10. chemicals that animals produce for communication
- 12. an animal without a backbone
- 19. _____ rhythms are daily cycles
- 20. behavior that is influenced by genes and does not depend on learning or experience
- 21. this type of behavior is the interaction between animals of the same species
- 23. an animal that eats other animals
- 25. an organism in an early stage of development