Answer:
Choice B
They are polar climates because they are dry
and cold
Silicon (Si). This is too reactive to be found in nature and is the most reactive in the list, followed by Chlorine (Cl), then Argon (Ar) then Helium (He)
Explanation:
Pyruvate cannot be a final electron acceptor in bacterial aerobic or anaerobic respiration except Fe3+,rather, pyruvate is an electron donor. Whereas Sulfur is the electron acceptor in anaerobic respiration(respiration in absence of oxygen). Hydrogen ions, Fe3+ and oxygen are final electron acceptor in aerobic respiration.( Respiration in presence of oxygen).