Most have one that is partially divided into two sub-chambers. This division can also be considered to be two ventricles. Crocodiles have a two ventricles that are completely divided from each other.
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An hexagon has 6 vertices
2+2+2+2+2+2+2+1 or 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1
2-1-2-1-2-1 1-2-1-2-1 -1-1-2-1 -2-2-1 -4-1 -5 Answer=-5
the left and right atria and the left and right ventricles
Any number raised to the zero power is equal to one. consider following: 2 ^ 2=4 2 ^ 1=2 2 ^ (2-1)= (2 ^ 2)/(2^1)=4/2=2 Similarly: 2^(1-1) = (2^1)/(2^1)=2/2=1