How did some stickleback populations come to live exclusively in fresh water?
the ancestors of freshwater sticklebacks are marine stickleback species that lived primarily in the ocean and migrated to freshwater to spawn.
sticklebacks developed traits that made them better adapted to fresh water and, as a result, they moved to a freshwater environment.
stickleback populations swam to freshwater lakes to spawn and stayed because there were no predators.
some stickleback populations became trapped in lakes that formed at the end of the last ice age.

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d