SSC IB Security Assistant & MTS Mock Test Series 2023 General Science Biology Zoology

Which of the following is true regarding structure of heart in fishes ? 

1
A four chambered heart with one atrium and one ventricle 
2
A four chambered heart with two atria and one ventricle 
3
A four chambered heart with two atria and two ventricles 
4
A two chambered heart with one atrium and one ventricle 
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