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population
community
ecosystem
habitat
biotic factors
abitotic Factors
interdependence
pollution
population density
trophic level
parasitism
mutualism
quadrat
belt transect
random sampling
biomass
producer
consumer
detrivore
bio-diversity
non-indigenous species
indigenous species
eutrophication
conservation
reforestation
food security
pest
pathogen
biofuel
decomposers
potable water
desalination
indicator species
