Multiple choice

Animals consume nitrogen mainly in the form of _________.

  1. solution

  2. proteins

  3. salts

  4. gas

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nitrogen is a vital ingredient to plant life. Most industrial fertilisers contain high concentrations of nitrogen compounds, such as ammonium nitrate. Animals eat plants and turn the nitrogen into proteins. When the animals die, bacteria break down the proteins, releasing N2 back into the atmosphere to begin the cycle again.