1. Vertebrate-an animal with a skull and a backbone; includes mammals, birds, reptiles,
amphibians, and fish.
2. Invertebrate-an animal without a backbone.
3. Embryo-an the organism in the earliest stage of development.
4. Tissue-a group of similar cells that work together to perform a specific job in the body.
5. Organ-a combination of two or more tissues that work together to perform a specific function
in the body.
6. Consumer-an organism that eats producers or other organisms for energy.
7. Predator-an organism that eats other organisms.
8. Prey-an organism that is eaten by another organism.
9. Innate behavior-a behavior that is influenced by genes and does not depend on learning.
10. Learned behavior-a behavior that is been learned from experience or observed.
11. Hibernation-a period of in activity that some animals experience in winter
that allows them to survive on stored body fat.
12. Estimation-a period of reduced activity that some animals experience that happens to animals in the summer.
13. Biological clock- an internal control of nature cycles.
14. Circadian rhythm-a natural, daily cycle.
15. Social behavior-the interaction animals of the same species.
16. Communication-a transfer of a signal from one animal to another that results in some type of response.
17. Territory-an area occupied by one animal or a group of animals from
which other members of the species are excluded.
18. Pheromone-a chemical produced by animals for cumminacation