Name Class
Date
Animals need nitrogen for a wide variety of compounds, including proteins and nucleic
acids. The following steps are part of a process by which animals acquire nitrogen. Which
of the steps occurs first?
~ Nitrogen compounds pass to animals through a food chain.
(В
A variety of soil bacteria convert ammonia into nitrates, nitrites, and other nitrogen
compounds
(c)
Soil bacteria act to "fix" atmospheric nitrogen to form ammonia.
Plants take in useful nitrogen compounds from the soil.