Which of the following best matches the description?Amount of oxygen used by decomposer organisms to degrade organic molecules in aquatic ecosystems.
A. desert
B. grassland
C. euphotic
D. periphyton
E. savanna
F. pioneer community
G. biochemical oxygen demand
H. tundra
I. pelagic
J. deciduous forest
K. benthic
L. marsh
M. littoral zone
N. phytoplankton
O. boreal forest
Answer: G
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