Question

How is the nitrogen cycle important to humans?

It produces free nitrogen that can remove carbon dioxide from the atmosphere.
It converts nitrogen into a form that humans can obtain by eating other organisms.
It produces nitrogen compounds that humans can breathe.
It converts nitrogen into a form that humans can obtain by absorbing it through their skin.

Answer 1

It converts nitrogen into a form that humans can obtain by eating other organisms.

Explanation: The nitrogen cycle fixes atmospheric N2 into usable forms (ammonia, nitrites, nitrates) that plants incorporate into proteins and nucleic acids. Animals and humans then obtain that nitrogen by eating plants or other animals.