Question

how do animals get nitrogen?
○ they break down glucose molecules into nitrogen.
○ they convert carbon to nitrogen during fixation.
○ they eat it in plants and other animals.
○ they breathe it in from the atmosphere.

Explanation:

• Glucose has no nitrogen, so first option is wrong.
• Carbon can't be converted to nitrogen, second option is wrong.
• Animals can't directly breathe in atmospheric nitrogen (most can't utilize N₂), so fourth option is wrong.
• Animals get nitrogen by consuming plants/other animals that have nitrogen - containing compounds.

Answer:

C. They eat it in plants and other animals.