Which of the following best matches the description?Attached organisms in freshwater streams and rivers.
A. deciduous forest
B. periphyton
C. benthic
D. marsh
E. phytoplankton
F. pioneer community
G. boreal forest
H. biochemical oxygen demand
I. desert
J. euphotic
K. littoral zone
L. savanna
M. tundra
N. grassland
O. pelagic
Answer: B
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