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Chapter 123


Organism A living thing.
Habitat An environment that provides all the things the organism needs to live, grow and reproduce.
Biotic Factors Living parts of a habitat.
Photosynthesis The process in which organisms use sunlight to make food.
Species A group of organisms that are physically simaler and can mate and reproduce.
Population All the members of one species in a particular area.
Community All the different populations that live together in an area.
Ecosystem The community of organisms that live in a particular area along with nonliving surrounding.
Ecology The study of how living things interact with one another and there environment.
Estimate An approximation of a number based on reasonable assumptions.
Birth Rate The number of births in a population over a certain amount of time.
Death Rate The number of deaths over a certain amount time.
Immigration Moving into a population.
Emigration Moving out of a population.
Population Density The number of individuals in an area of specific size.
Limiting Factor An environmental factor that causes a population to decrees.
Carrying Capacity The largest population an area can support
Abiotic Factors Nonliving parts of an organisams habitat
Natural Selection A characteristic that makes an individual better suited to it's environment may even become common in that species.
Adaptation The behavior and physical characteristic that allow organisms to live successfully in there environment.
Niche The role of an organism in it's habitat or how it makes it's living.
Competition The struggle between organisms to survive as they attempt to use the same limited resource.
Predatation An interaction in which one organism kills another for it's food.
Predator The organism that does the killing.
Prey The organism that gets killed.
Symbolism A close relationship between two species that benefits at least one of the species.
Mutualisam A relationship in which both species benefit.
Commensalism A relationship in which one species benefits and the other is neither helped or harmed
Parasitism One species is helped the other harmed.
Parasite The species that benefits
Host The species that is harmed.
Created by: asanestlehutt