Manatees and seals both share some phenotypic similarities t
     Manatees and seals both share some phenotypic similarities that are adaptations to an aquatic environment. However, seals evolved from a bearlike carnivore and manatees evolved from a hoofed mammal. This example shows that  evolution is not always unidirectional.  evolution can occur rapidly for one species while the other species stays relatively unchanged  similarity is a good predictor of how long it has been since two species shared a common ancestor evolution is not always divergent 
  
  Solution
Answer- D- evolution is not always divergent because the above mentioned example comes under independent evolution sharing similar features in species of different lineages/ species.

