How did photosynthesis lead to ozone forming to protect Earth from harmful ultraviolet radiation?

In the presence of sunlight, oxygen molecules in the atmosphere react to form ozone. ... The iron minerals have special qualities -- They absorb harmful ultraviolet radiation, but the part of the sunlight needed for photosynthesis can still be used by organisms.

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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.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.