3. Newton's Second Law of Motion shows a relationship between and please fill in the three blanks ?

Force, mass and acceleration

Explanation:

I'm assuming that you meant three blanks in a row

Mass & acceleration

Explanation:

Force = Mass × Acceleration

e.g The greater the mass of the object ,the more force it will take to accelerate the object & applying more force will make the object to move faster

b would be the right answer

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.