Fill in the blanks with the appropriate words:

Dolphins have developed a number of similar personality ____(1)____ to humans, despite having ____(2)____ in vastly different environments, researchers have found. A study, published in the Journal of Comparative Psychology, looked at 134 male and female bottlenose dolphins from eight facilities across the world, with each dolphin’s personality being ____(3)____ by staff at the facilities. The results of the study found a convergence of certain personality traits, especially curiosity and sociability. The study has ____(4)____ researchers in understanding how certain human personality traits developed independently of immediate environments. These similarities were ____(5)____ despite dolphins having evolved in a completely different environment from primates, with the last common ancestor living about 95m years ago.