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Forest
Y
100%
Dense collection of trees covering a relatively large area
Savanna
Y
100%
Mixed woodland-grassland ecosystem
Desert
Y
100%
Area of land where little precipitation occurs
biogeocenosis
Y
100%
ecological system
Drylands
Y
100%
Water-scarce areas
Marsh
?
TBD
Low-lying and seasonally waterlogged land
predator–prey system
?
TBD
ecosystem interaction
Agroecosystem
?
TBD
basic unit of study in agroecology
