If an organism has 18 chromosomes in its reproductive cells, then how many autosomal homologous pairs does the organism have in the nuclei of its somatic cells?
a. 36
b. 34
c. 22
d. 20
e. 17

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.

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a. 35°c

b. 25°c

c. 10°c

d. 40°c