How do humans get the nitrogen they need?
A. By breathing
B. By eating plants
C. Through cellular respiration
D. Through photosynthesis
Answer (1)
Humans get the nitrogen they need primarily by consuming plants and animals that have consumed plants. Nitrogen is essential for proteins and nucleic acids, and is absorbed from the soil by plants, which are then eaten by humans. Other options, such as breathing and photosynthesis, do not contribute to nitrogen intake for humans. ;
