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| 7198133051 | What does the nitrogen cycle do? | The nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. |  | 0 |
| 7196082746 | Why is nitrogen important? | Nitrogen is an essential component of amino acids and of nucleotides (the building blocks of DNA), and consequently is needed by all living things. |  | 1 |
| 7198136215 | What do amino acids do? | They build proteins! Proteins are the essential building blocks of all living things. |  | 2 |
| 7196085029 | How does it impact food production? | The nitrogen cycle reflects a more intimate side of energy needs, via its central role in the production of food. It is one of the places where the chemistry of the Earth and life come together, as plants extract nitrogen from their environment, including the air, to make food. Controlling the impact of agriculture on the global cycle of nitrogen is a growing challenge for sustainable development |  | 3 |
| 7196088105 | Will excess fixed nitrogen increase? | YES! Globally, until nitrogen fixation is balanced by denitrification, the amount of excess fixed nitrogen in the world will grow relentlessly, with increasing consequences for ecosystems and the public health |  | 4 |
