35. Soil

How do herbivores obtain the nitrogen they need?

How do most plants obtain the nitrogen they need for growth?

Why is the nitrogen cycle important to humans?

Nitrogen enters the roots of plants in a process called:

Which process is responsible for converting atmospheric nitrogen gas (\(N_2\)) into biologically usable forms such as nitrite (\(NO_2^-\)) and nitrate (\(NO_3^-\))?

How do animals obtain usable nitrogen for their biological processes?

Where do plants primarily obtain the nitrogen necessary for synthesizing amino acids and DNA?

What is the primary role of decomposers in the nitrogen cycle?

Which process is primarily responsible for returning nitrogen to the atmosphere in the nitrogen cycle?

For what essential biological purpose do plants and animals require nitrogen?

Why must atmospheric nitrogen (\(N_2\)) be 'fixed' before most organisms can use it, and which organisms are primarily responsible for this process?

Why do plants and animals need nitrogen?

How do animals obtain nitrogen for use in synthesizing proteins?

Why do organisms require nitrogen?

Why can't plants and animals use nitrogen (N_2) directly as it is found in the atmosphere?