(C) $Marchantia$ is considered a heterothallic plant because it is dioecious.In $Marchantia$,the male and female reproductive structures (antheridioph

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(C) $Marchantia$ is considered a heterothallic plant because it is dioecious.In $Marchantia$,the male and female reproductive structures (antheridiophore and archegoniophore) are borne on separate individual thalli.Therefore,the plant body is unisexual,which is referred to as dioecious or heterothallic.