Lab #21 Evidence for Change across Time GOALS TODAY: 1. Share your findings with your group. 2. FINAL SUMMARY TURN INTO BASKET: What does the evidence suggest has happened to organisms on earth over time? • Construct an explanation and use at least 4 pieces of evidence to defend your ideas. Lab #21 Evidence for Evolution 4. Molecular Biology – DNA Comparison the more similar molecules are between two organisms, the more closely related they are. Lab #23 Evidence for Evolution 5. Fossil Record Fossils across continents Same species appear to have lived on multiple continents Fossils shows gradual changes throughout time of structures Stratification – Fossil age determined by where it is found in sediment Lab #21 Evidence for Evolution 6. Comparative Anatomy Homologous Structures - Wings, hands, feet of different species have almost identical structures. Lab #23 Evidence for Evolution 7. Comparative Anatomy Vestigial Structures - Structures that seem to do nothing for the species, but are important in similar species Lab #21 Evidence for Evolution 8. Embryology The study of developmental stages – Vertebrate embryos that have the same developmental pattern are more closely related. Lab #23 Evidence for Evolution 9. Phylogenetic Trees or Cladograms Illustrate evolutionary relationships based on shared inherited characteristics.