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species richness :
The number of different species in a community.
Relative abundance:
The number of how many individuals are present for each species.
Ecology:
study of living organisms in their nonliving world
Biotic factor:
living item (ex: bacteria)
Abiotic factor:
not living item (ex: rock)
Ecosystem service:
the many and varied benefits to humans gifted by the natural environment and from healthy ecosystems.
Range of Tolerance:
range of environmental conditions that are tolerable for survival in a species
Competitive Exclusion Principle:
species with the same niche in the same area cannot coexist
Keystone Species:
often a dominant predator whose removal allows a prey population to explode and often decreases overall diversity. Ex: sea otter