Question

How is nitrogen gas in the atmosphere converted to a form usable by living creatures?

Select all that apply.

fixation

sublimation

transpiration

lightning

Answer 1

Nitrogen gas in the atmosphere is converted into a usable form by living creatures through nitrogen fixation and lightning.

Step-by-step explanation:

Nitrogen gas in the atmosphere is converted into a form usable by living creatures through a process called nitrogen fixation. This process is carried out by special nitrogen-fixing bacteria that can transform nitrogen gas into useful forms such as ammonium (NH4+).

Another way nitrogen gas is converted is through lightning. When lightning strikes, it breaks nitrogen molecules and enables their atoms to combine with oxygen in the air, forming nitrogen oxides. These nitrogen oxides dissolve in rain, forming nitrates that can be carried to the Earth and used by plants.

Therefore, the correct answers are:

1. Nitrogen fixation
2. Lightning

Answer 2

fixation

Step-by-step explanation:

Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants. Recently fixed ammonia is then converted to biologically useful forms by specialized bacteria.