Question

One of the free-living anaerobic nitrogen-fixer is (1)Azotobacter (2)Beijernickia (3)Rhodospirillum (4)Rhizobium

Answer 1

${\huge{\boxed{\mathbf{\red{♡ANSWER♡}}}}}$.

$\huge\mathbf{Option 3...}$✔

$\huge\mathbf{Rhodospirillum}$