suggest two factors other than the rate of nitrogen fixation that may affect the avality of nitrogen in the marine ecosystem

run off from land/rivers and phytoplankton blooms

Explanation:

Nitrogen, particularly as nitrate is easily leached from soil. Human agriculture relies on fertilisers with significant nitrate content that applied at levels higher than it can be used. The balance end up as runoff, much of which ends up in

answer: b

coz red blood cells marrow and circulates the body for 120 days.