Ers. to some
s of the ecosystem
in an antarctic ecosystem, phytoplankton are the main producers
species of zooplankton, called krill, are the primary consumers. to
extent, fish, penguins, seals, whales, and other animals of the eco
depend on krill to survive. which of these is a biotic factor in this
ecosystem?

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.