In arteriosclerosis, hardened arteries cannot expand to handle the blood that enters the vessel when the heart contracts. therefore, pressure in the artery and causes the heart to

increases, more that's the correct answer and i'm %100 SURE!

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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.