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