are trying to determine the relationship between various groups of organisms The researchers analyze the amino acid sequence of

Question

are trying to determine the relationship between various groups of organisms The researchers analyze the amino acid sequence of the protein cytochrome c in various groups of organisms Once they sequence cytochrome cin all organisms they determine the number of amino acid substitutions in each group The results can be seen in the graph below which plots the data with respect to the time since the divergence of the members of paired groups from a common ancestor A mammals and reptiles B Number of Amino Acid Substitutions per 100 amino acids in Cytochrome c C 60T 50 40 30 20 10 0 0 fish and land vertebrates 400 200 600 800 1 000 1 200 Time Since Divergence from a Common Ancestor millions of years O birds and reptiles A graph showing when various groups of organisms diverged from a common ancestor mammals and reptiles Based on the graph above can you conclude which of the following organisms are most distantly related amphibians birds and mammals fish and land vertebrates insects and vertebrates Vinsects and vertebrates flowering plants and animals birds and mammals

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