All seed plants see concept 30.1 (page 635) view available hint(s) all seed plants see concept 30.1 (page 635) are nonvascular produce antheridia and aronia on the same gametophyte exhibit a dominant gametophyte generation produce flowers are heterosporous

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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.