For biologists who regard their field of study as belonging to [[physical science]], issues of [[psychology]] and spirituality take a back seat. They emphasize the physical similarities between the [[human body]] and the bodies of other creatures, classifying humans as [[mammal]]s, specifically, [[primate]]s. | For biologists who regard their field of study as belonging to [[physical science]], issues of [[psychology]] and spirituality take a back seat. They emphasize the physical similarities between the [[human body]] and the bodies of other creatures, classifying humans as [[mammal]]s, specifically, [[primate]]s. |