Why do drive-reduction approaches fail to offer a complete account of human motivation? people are sometimes motivated to increase rather than decrease their level of stimulation. drive-reduction approaches are vague about what, or even how many, primary drives exist. drive-reduction approaches offer much better explanations of behaviors motivated by secondary drives than of behaviors motivated by primary drives. homeostasis does not accurately describe the mechanism by which primary drives operate.

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote