Question

Which of the following is most directly responsible for nitrogen fixation? a. Sunlight b. Animals C. Plant roots d. Bacteria e. "Humans ​

Answer 1

bacteria

hope it helps...

Answer 2

d. Bacteria

Step-by-step explanation:

Nitrogen fixation is mostly done by bacteria living in the soil. Plants need nitrogen to grow, but they cannot use it straight from the atmosphere or as ammonia from the soil.