Why is it unlikely that the frequency of muscular dystrophy in the human population will be reduced quickly by means of natural selection? a) natural selection acts only on homozygous recessive individuals b) muscular dystrophy is not a genetic disorder. c) the frequency of homozygous recessive individuals is too great. d) homozygous dominant individuals can have affected children.

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explanation:

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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.