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19 Cards in this Set

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commensalism
symbiotice relationship in which one species benefits and the other internal organs are suspeneded; human, fish, and insects are coelomates.
biotic factor
all living organisms in habiting ay of earth's many different environments.
biosphere
life-supporting protions of earth composed of air, land, freshwater, and saltwater.
autotroph
organisms that are able to synthesize food using sum energy stored in chemical compunds; plants are the most common autotroph
abiotic factor
nonliving parts of the environment such as air current, temperatture, soil, light, and moisture.
trophic level
link represented by each organism in a food chain; represents a feeding step in the transfer of energy and matter in an ecosystem.
symbiosis
permanent, close association between two or more organisms of different species.
scanvenger
animal such as a vulture that plays a positive role in the ecosystem by consuming dead organisms and their refuse.
population
interbreeding individuals of one species that compete with one another for food, water and mates and live in the same place at the same time.
parasitism
symbiotic relationship in which one species benefites at the expeense of the other species; examples are ticks and tapeworms.
niche
role of a particular species in a community regarding food, space, reprodction, and how it interacts with abiotic factors.
mutualism
symbiotic relationship beneifical to both species; acacia trees and ants have a mutualistic relationship.
heterototroph
organisms unable to make their oun food, they roly on autotrophs as their nutrient and energy source; examples are rebbits and cows; also called consumers.
habitat
collectio of niches in which an organism lives its life.
food web
shows all the possible feeding relationship in a community at each trophic level; represents a network of interconnected food chains.
food chain
a possible route for the transfer of matter and energy through on ecosytem from autotrophs through heterotrophs and decomposers.
ecoystem
populations in a community and abiotic factors with whish they interact; examples are terrestrial and marine ecosytems.
decomposer
organisms, such as many bacteria and most fungi, that play beneficial roles in all ecosytems by breaking down and absorbing nutrients from dead and decaying organic matter.
ecology
scientific study of interations between organisms andt their environments; for example, ecologists study how day length influences migrating bird behavior