Read the following statements w.r.t. heart and circulatory system : 

(i) Birds, mammals and crocodiles have a four chambered heart 

(ii) In amphibians and reptiles the left atrium receives deoxygenated blood 

(iii) Annelids have an open circulatory system 

(iv) In amphibians oxygenated and deoxygenated blood may get mixed in the ventricle but usually do not mix 

(v) Closed circulatory system is more advantageous than open one as the flow of fluid can be more precisely regulated 

Which of the above statements are correct ?