Question ID:PT75 S3 Q16 Passage:Theorist:  To be capable of planned locomotion, an organism must be able both to form an internal representation of its environment and to send messages to its muscles to control movements. Such an organism must therefore have a central nervous system. Thus, an organism incapable of planned locomotion does not have a central nervous system. Stem:The theorist's argument is flawed in that it Correct Answer Choice:AChoice A:confuses a necessary condition for an organism's possessing a capacity with a sufficient one Choice B:takes for granted that organisms capable of sending messages from their central nervous systems to their muscles are also capable of locomotion Choice C:presumes, without providing justification, that planned locomotion is the only biologically useful purpose for an organism's forming an internal representation of its environment Choice D:takes for granted that adaptations that serve a biologically useful purpose originally came about for that purpose Choice E:presumes, without providing justification, that an internal representation of its environment can be formed by an organism with even a rudimentary nervous system