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ecology

the branch of biology that deals with the relations of organisms to one another and to their physical surroundings

biosphere

the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms

biotic factor

living things in their ecological relations

abiotic factor

physical rather than biological; not derived from living organisms

population

all the inhabitants of a particular town, area, or country

biological community

all the interacting populations of different species that live in the same geographical location at the same time

ecosystem

a biological community of interacting organisms and their environment

biome

a large naturally occurring community of flora and fauna occupying a major habitat

habitat

the natural home or environment of an animal, plant, or other organism

niche

role, or position, of an organism in its environment

predation

act of one organism feeding on another

symbiosis

close mutualistic, parasitistic, or commensal association between 2 or more species that live together

mutualism

symbiotic relationship where both species benefit

commensalism

symbiotic relationship in which one organism benefits and the other is neither helped nor harmed

parasitism

symbiotic relationship where on organism benefits at the expense of another

individual - population - community - ecosystem - biome - biosphere

order from most specific to broadest

individual / organism

any unicellular or multicellular form (with the characteristics of living things)

population size

a number of organisms present in a given population at a given time

population density

number of individuals within a population per unit area

producer/consumer, predator/prey, parasite/host

3 main types of feeding relationships

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