A biologist is studying two tortoise species with each species located on a separate island. The biologist believes there is an evolutionary relationship between the two species. Choose 2 lines of evidence the
biologist could use to support the belief that there is an evolutionary relationship between the two
species. Explain how the biologist could use each of your chosen lines of evidence to demonstrate the
evolutionary relationship between the two tortoise species.

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.