(B) The ancestors of mammals are the $Therapsida$,which were a group of synapsids that evolved during the $Permian$ period.These organisms possessed f

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(B) The ancestors of mammals are the $Therapsida$,which were a group of synapsids that evolved during the $Permian$ period.These organisms possessed features intermediate between reptiles and mammals,eventually giving rise to the first true mammals during the $Triassic$ period.