Which of the Following Best Matches the Description

Multiple Choice

Which of the following best matches the description?
-Bacteria that convert atmospheric nitrogen gas into forms of nitrogen that plants can use.

A) denitrifying bacteria
B) herbivore
C) omnivore
D) producer
E) trophic level
F) community
G) ectoparasite
H) limiting factor
I) none of above
J) secondary consumer
K) nitrogen cycle
L) biomass
M) habitat
N) carbon cycle
O) interspecific competition
P) nitrogen-fixing bacteria
Q) intraspecific competition