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Vocabulary Chapter 1, 4

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Organism
A living thing
Habitat
An environment that provides the things an organism needs to live, grow and reproduce
Biotic Factor
A living part of an organism's habitat
Photosynthesis
The process in which organisms use water along with sunlight and carbon dioxide to make their own food
Species
A group of organisms that are physically similar and can mate with each other
Community
All the different populations that live together in a particular area
Ecosystem
The community of organisms that live in a particular area
Ecology
The study of how living things interact with each other and their environment
Birth Rate
The number of births in a population in a certain amount of time
Carrying Capacity
the largest population that an area can support
Death Rate
The number of deaths in a population in a certain amount of time
Emigration
Leaving a population
Estimate
An approximation
Immigration
Moving to a population
Limiting Factor
An environmental factor that causes a population to decrease
Population Density
The number of individuals in an area of a specific size
Adaptations
A behavior or physical characteristic that allows an organism to live successfully in its environment
Commensalism
A relationship between two species in which one species benefits and the other in neither helped nor harmed
Competition
The struggle between organisms to survive as they attempt to use the same limited resource
Host
The organism that a parasite lives in or on in a parasitism interaction
Mutualism
A relationship between two species in which both species benefit
Natural Selection
A process by which characteristics that make an individual better suited to its environment become more common in a species
Niche
The role of an organism in its habitat, or how it makes its living
Parasite
The organism that benefits by living on or in a host in a parasitism interaction
Parasitism
A relationship in which one organism lives on or in a host and harms it
Predation
An interaction in which one organism kills another for food
Predator
The organism that does the killing in a predation interaction
Prey
An organism that is killed and eaten by another organism
Symbiosis
A close relationship between two species that benefits ar least one of the species
Pioneer Species
The first species to populate an area
Primary Succesion
The series of changes that occur in an area where no soil or organisms exist
Secondary Succession
The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist
Succession
The series of predictable changes that occur in a community over time