35. Soil

Bacteria in root nodules change nitrogen gas (\(N_2\)) into what form?

Why do all organisms need nitrogen?

Which process allows plants to obtain nitrogen from the atmosphere, making it available for their growth?

Which type of organisms are capable of fixing atmospheric nitrogen (N_2) into a biologically usable form?

Which of the following is a way that nitrogen fixation can occur in nature?

Why do plants need nitrogen?

Which of the following is one of the key components of the nitrogen cycle?

In the context of nitrogen fixation, where is the majority of nitrogen stored in the Earth's ecosystem?

Which of the following is most directly responsible for nitrogen fixation?

Which of the following is primarily responsible for converting atmospheric nitrogen (\(N_2\)) into a form usable by plants and animals?

Why is nitrogen fixation an essential process in ecosystems?

Why do plants require assistance in converting atmospheric \(\mathrm{N_2}\) into a usable form, and which organisms typically provide this help?

What is the primary use of nitrogen in living things?

Why is nitrogen fixation necessary for most living organisms?

How must carnivores obtain their nitrogen?