The main objective of the national origins act of 1924 was

a. to reduce immigration from canada and latin america

b. to favor immigration from eastern and southern europe

c. to favor immigration from northern and western europe

d. to provide equal opportunity to immigrants from all nations

Option C

Explanation: The purpose of the national origins act of 1924 was to limit the number of people coming it the US. It is a law that rigorously limits immigration by establishing a system of nationwide quotas that bluntly differentiated against immigrants from Southern and Eastern Europe and essentially excluded Asians. The policy remained in effect until the 1960’s

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.