Which of the following statements is not true about nitrogen fixation?

1)

it is the conversion of nitrate or ammonia to atmospheric nitrogen
2)

bacteria can biologically fix nitrogen
3)

ammonia can be converted to salts to use as fertilizers
4)

inorganic fertilizers are produced using industrial nitrogen fixation
5)

lightning and sunlight can convert n2 to no3 in the atmosphere

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Answer the use of flood plains and irrigation;