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

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