The strength of gravitational force is affected by the mass of objects and which of the following?

a
distance
b
speed
c
velocity
d
weight

It’s A. Distance

The strength of the gravitational force between two objects depends on two factors, mass and distance

d. the weight of the book

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.