Topics: Ecosystem, Biology, Ecology Pages: 2 (496 words) Published: May 6, 2013
Basic Ecology Terms:
Ecology- the study of how organisms interact with their environment Organism- a living thing that gets food, water, shelter, and other things it needs to live, grow, and reproduce from its environment Habitat- environment that provides needed things

Biotic Factors- the living part of a habitat
Abiotic Factors- the non-living part of a habitat (soil, oxygen, water, sunlight, temperature) Species- a group of organisms that can mate with each other and produce offspring that can reproduce Population- all members of one species that liv together in an area Community- different populations that live together in an area Ecosystem- the community of organisms that live together in a particular area, along with the non-living Population vocabulary study guide:

Direct observation- the easiest method. You just have to count everyone Indirect observation- observe signs of organisms instead of the organism themselves Sampling- an small estimation of a population

Mark and recapture- uses a math formula to figure out the population Immigration- moving into a population
Emigration- Moving out or leaving a population
Population statement-
Birth rate > death rate = population size increases
Birth rate < death rate= population size decreases
Population Density- # of individuals/ unit area
Limiting factors- environmental factor that causes a population to decrease (food, water, space) Limiting factors space and water
Invasive species: species that are alien to the natural environment Interactions among organisms:
Niche- The role of an organism in its habitat, or how it makes its living Adaptations- The behaviors and physical characteristics that allow organisms to live successfully in their environments. Competition- the struggle between organisms to survive as they attempt to use the same limited resource Predation- An interaction in which one organism kills another for food Predator- The organism that does the killing

Prey- The organism...
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