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For example, as trees and mutualistic fungi work together, a larger proportion of heavy nitrogen isotopes are left in the fungi, as heavy isotopes are more difficult to move.

In general, samples collected from sites associated with high habitation had the most heavy nitrogen and were also in a poorer state.

Scientists aren't sure whether heavy nitrogen ice eroded the lighter water ice to create the depressions.

On Mars the ratio of heavy nitrogen, which has an extra neutron in its nucleus, to regular nitrogen is twice that of Earth.

By comparing the nitrogen isotope ratios in the food and human blood samples, they were able to estimate how much heavy nitrogen the human body stores.