Answer:
Ammonia, urea, uric acid
Explanation:
The given compounds are:-
Urea which has a molecular formula of [tex]CH_4N_2O[/tex] and has 2 atoms of nitrogen per molecule.
Ammonia which has a molecular formula of [tex]NH_3[/tex] and has 1 atom of nitrogen per molecule.
Uric acid which has a molecular formula of [tex]C_5H_4N_4O_3[/tex] and has 4 atoms of nitrogen per molecule.
Thus,
The order from least to most nitrogen is:-
Ammonia, urea, uric acid