HELP PLS Danielle lives with her family on a farm. In school, she has been learning about the nitrogen cycle in science class. She knows that her father spread a nitrogen-based fertilizer on a patch of grass recently where the cows graze in the field. Why was it necessary to add a nitrogen-based fertilizer to the soil where there was a patch of grass?

a.because nitrogen can only be “fixed” by lightning
b.because there are no decomposers on the farm
c.because bacteria released all of the nitrogen into the air
d.because plants cannot use “free” nitrogen

It necessary to add a nitrogen-based fertilizer to the soil where there was a patch of grass - d. because plants cannot use “free” nitrogen.

Nitrogen cycle is the series of processes where nitrogen converts into its compound move through the environment and in living organisms.

The processes here include fixation, ammonification, nitrification and denitrification.
Majority of Earth's atmosphere is nitrogen.
Nitrogen fixation is the process allows free nitrogen to available for plants.
Plants can not use free nitrogen their for they require fixation and nitrogen fixating bacteria in nature.

nitrogen fertilizers provide nitrogen for plants in soil therefore it necessary to add a nitrogen-based fertilizer to the soil.

Thus, It necessary to add a nitrogen-based fertilizer to the soil where there was a patch of grass - d. because plants cannot use “free” nitrogen.

Learn more:

https://brainly.com/question/11662775