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Chapter 4 Vocab
Ecosystems and Communities
18
Biology
9th Grade
01/30/2007

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Term
weather
Definition
day to day condition of Earths atmosphere at a particular time and place
Term
climate
Definition
The average year after year conditions of temperature and precipitation in a particular region
Term
greenhouse effect
Definition
natual situation in which heat is retained by this layer of greenhouse gases
Term
polar zone
Definition
Cols areas where the sun's rays strike Earth at a very low angle
Term
temperate zone
Definition
sit between the polar and tropi zones
Term
Tropical zone
Definition
Near the equator between 23.5 North and 23.5 South latitude
Term
biotic factors
Definition
influences on organisms within an ecosystem
Term
abiotic factor
Definition
physical or nonliving factors that shae ecosystems
Term
niche
Definition
full range of physical and biological conditions in which an organism lives and the only way in twhich the organism uses those conditions
Term
resource
Definition
any necessity of life,such as water,nutrients,light,food,or space
Term
competitiver exclusion principal
Definition
ecological rule that states no two species can occupy the same exact niche in the same habitata at the same time
Term
competitiver exclusion principal
Definition
ecological rule that states no two species can occupy the same exact niche in the same habitat at the same time
Term
predation
Definition
an interaction in which one organism captures ans feeds on another organism
Term
symbiosis
Definition
any relationship in which two species live closely together
Term
mutalism
Definition
any relationship in which both specied benefit from the relstiondhip
Term
commensalism
Definition
one memeber of the association benifits and the other is neither heped nor harmed
Term
parastism
Definition
when one organism lives on or instide another organism and harms it
Term
ecological succession
Definition
changes that occurs in a community over time
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