What life form can change toxic ammonia into nitrate?

Certain bacteria, specifically nitrifying bacteria, can convert toxic ammonia into nitrate through a process called nitrification. This process involves two main groups of bacteria: ammonia-oxidizing bacteria (AOB), which oxidize ammonia to nitrite, and nitrite-oxidizing bacteria (NOB), which further oxidize nitrite to nitrate. These bacteria play a crucial role in the nitrogen cycle, helping to mitigate the toxicity of ammonia in the environment.