What would happen to the Nitrogen moving through the nitrogen cycle if all of the denitrifying bacteria disappeared today? What would this mean for life on Earth?

The nitrites would not be converted to nitrates, resulting in an accumulation of ammonia molecules.

Explanation:

Hope this helps :)

Bacteria are vital in keeping nitrogen cycling through the ecosystem, and nitrogen is vital to plant growth. ... Without bacteria around to break down biological waste, it would build up. And dead organisms wouldn't return their nutrients back to the system

If all the nitrogen-fixing bacteria disappeared, plants and animals wouldn't receive the nitrogen compounds they need to carry out certain functions.

Explanation:

its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=