(A) In earthworms ($Pheretima$ $posthuma$),there are four pairs of tubular hearts that help in the circulation of blood.These hearts are located in se

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(A) In earthworms ($Pheretima$ $posthuma$),there are four pairs of tubular hearts that help in the circulation of blood.These hearts are located in segments $7, 9, 12,$ and $13$.- The lateral hearts are present in segments $7$ and $9$.- The latero-oesophageal hearts are present in segments $12$ and $13$.