Lesson 3

Question Answer
Birth Rate The number of births per, 1,000 individuals for a certain period.
Death Rate The number of death per 1,000 individuals for a certain period.
Immigration Movements of individuals into a populations area.
Emmigration Movements of individuals out of a populations area.
Population Density The number of individuals in a area of specific species.
Limiting Factor An environmental factor that causes a population to decrease in size.
Carrying capacity The largest population that a particular environment can support.
Natural selection The process by which organisms that are best adapted to the environment are most likely to survive and reproduce.
Adaptions An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment.
Niche How an organism makes its living and interacts with the biotic and abiotic factors in its habitat
Competition The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time
Prey An organism that is killed and eaten by another organism in a predation interaction.
Predator The organism that does the killing in a predation interaction.
Predation An interaction in which one organism kills another for food or nutrients.
Symbiosis Any relationship in which two species live closely together and that benefit at least one of the species.
Mutualism A type of symbiosis in which both species benefit from living together.
Host An organism that a parasite lives with, in, or, on, and provides a source of energy or a suitable environment for the parasite to live.
Parasite The organism that benefits by living with, on, or in a host in a parasitism interaction.
Parasitism A type of symbiosis in which one organism lives with on, or in a host and harms it.
Commensalism A type of symbiosis between two species in which one species benefits and the other species is neither helped or harmed.

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