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The organs for digestion, excretion, and reporduction arelocated in the
Abdominal cavity
"Mesocardium" is the term among the following choices given in the question that refers to the membrane between the outermost and innermost part of the heart. The correct option among all the options that are given in the question is the second option. I hope that this is the answer that has come to your help.
That’d be A and B(1st and 2nd). :)