Examine the differences between the common ancestor’s original gene and the genomes of the existing species. How can these changes affect the development of the protein in the descendant 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.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above