Digestion starts in the mouth with the salivary amylase. This enzyme breaks down starches like potatoes to release energy. The salivary amylase is an example of and the starch is an example of . *

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explanation:

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

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.