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

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.