| A | B |
|---|
| invertebrate | animals without backbones |
| vertebrate | animals with backbones |
| multicellular | made up of more than one cell |
| embryo | organism at an early stage of development |
| budding | when part of an organism breaks off and begins to fevelop into a new organism |
| tissues | collections of similar cells |
| organs | groups of tissues that carry out specialized functions |
| consumer | an organism that eats other organisms |
| innate behavior | behaviors that do not depend on learning or experience |
| learned behavior | behavior that has been learned from eperience or observing |
| territory | an area that is occupied by one animal or a group of animals that do not allow other members of the species to enter |
| courtship | behaviors that help animals find a mate |
| migrate | to travel from one place to another in search of more favorable conditions |
| landmarks | fixed objects that an animal uses to find its way during migration |
| hibernation | period of inactivity and lowered body temperature that some animals undergo |
| estivation | a period of inactivity and lowered body temperature that animals mighgt undergo in the summer |
| circadian rhythm | a biological daily cycle |
| biological clock | internal control |
| social behavior | the interaction between animals of the same species |
| communication | a transfer of a signal or message from one animal to another |
| pheromone | a substance that is released by the body and that causes another individual of the same species to act in a predictable way |
