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cycles
science
15
Science
6th Grade
03/12/2009

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Cards

Term
the steps of water cycle
Definition
condensation, evaporation, precipitation, transpiration, surface runoff
Term
what percentage of the air is nitrogen
Definition
78%
Term
role of decomposers in the co2 cycle
Definition
to return carbon to soil and release co2
into the air
Term
fixation
Definition
making free nitrogen into a usable form
Term
legumes
Definition
plants that can fix nitrogen
Term
role of a producer in the co2 cycle
Definition
to take co2 from the air and return sugars/starches into the soil
Term
photosynthesis
Definition
producers take in co2 and produce sugars
Term
natural selection
Definition
the characteristics an organism has the help to survive and reproduce in its environment. (on test be able to give example)
Term
adaptation
Definition
change an orgranism makes based on its environment. (be able to list predator adaptations), (know the prey adaptations in the book.)
Term
niche
Definition
the role of an organism in its environment
Term
competition
Definition
the struggle between organisms as they use the same limited resource
Term
predation
Definition
the interaction in which one organism eats the other for food
Term
symbiosis
Definition
a close relationship between two species that benefits at least one of the species
Term
the 3 typs of symbiosis
Definition
mutualism, commensalism, & parasiitism
Term
what are the ways humans affect the co2
cycle
Definition
humans burn oil and other fuels, releasing oxygen into the atmosphere; when humans clear forests for lumber, fuel, and farmland, carbon dioxide levels rise.
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