CH 11 and 12 Vocabulary


Chapter 11 and 12 Vocabulary









An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment






A threatening behavior that one animal uses to gain control over another animal


Birth Rate




The number of births per 1000 individuals for a certain time period


Carrying capacity



The largest population that a particular environment can support


Circadian behavior/rhythm



A behavior cycle that occurs over a period of about one day






The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time


Courtship behavior



The behavior in which males and females of the same species engage to prepare for mating


Death rate




The number of deaths per 1000 individuals for a certain time period






Movement of individuals out of a population’s area






An animal’s state of greatly reduced activity that occurs during winter






Movement of individuals into a population’s area


Limiting factor




An environmental factor that causes a population to decrease in size


Natural Selection



The process by which organisms that are best suited/adapted to their environment are most likely to survive and reproduce






A chemical released by one animal that affects the behavior of another animal of the same species


Pioneer species




The first species to populate an area during succession


Population density



The number of individuals in an area of a specific size


Primary succession



The series of changes that occur in an area where no soil or organisms exist.






A group of closely related animal of the same species that work together in a highly organized way for the benefit of the group






The series of predictable changes that occur in a community over time






An area that is occupied and defended by an animal or group of animals