Which of the following best matches the description?Series of stages in the flow of nitrogen in ecosystems.

A. intraspecific competition
B. carbon cycle
C. limiting factor
D. ectoparasite
E. nitrogen-fixing bacteria
F. habitat
G. trophic level
H. secondary consumer
I. biomass
J. omnivore
K. community
L. interspecific competition
M. producer
N. denitrifying bacteria
O. herbivore
P. nitrogen cycle


Answer: P

Environmental & Atmospheric Sciences

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