Nitrogen fixation
a. is the process where nitrogen is converted to a usable form
b. is accomplished by plants when they break down soil
c. occurs as a result of photosynthesis
d. none of the above

Nitrogen fixation .

b. is accomplished by plants when they break down soil

Explanation:

To understand this answer we have to analyze the options. First of all, a is incorrect because without nitrogen fixation nitrogen can be used. Nevertheless, it is the only process that makes nitrogen usable for plants or microorganisms, but the statement lacks information to be the truth.

c. is incorrect because nitrogen fixation is carried out before the photosynthesis process. Not after and as a cause of it.

d. is wrong because it is part of the soil break down process.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2