What was the mission that led Darwin's boat to sea?
Discovering proof of evolution
Clalming South American land for Great Britain
Looking for South American gold deposits
Mapping the South American coastline

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Explanation:

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.

voluntary muscles are controlled by the cerebellum.