6.1 Evidence of Evolution

(Fossil Record) The data in the diagram is evidence that -

• A new species of horse suddenly appeared.

• Horses slowly developed over time.

• Horses have similar stages of rapid embryological development.

• Horses have a common ancestry with other hooved animals.

(Molecular Homology) Which organism is the LEAST related to the other three organisms?

• Organism 1

• Organism 2

• Organism 3

• Organism 4

(Biogeography) Which statement is best supported by the observable structures of the different humerus bones?

• The primates lived in similar environments.

• The primates shared a common ancestor.

• The primates interbreed with similar organisms in a population.

• The primates had diets that consisted of similar types of foods.

(Homologous anatomy) Which statement provides the best evidence that Ambulocetus natans is an ancestor of Basilosaurus isis?

• Homologous structures occur in each fossil.

• Similar nitrogenous bases are found in the DNA of each fossil.

• The fossils were found in different locations.

• The youngest fossil is larger than the older fossils.

(Developmental homology) The image visualizes the developmental homologies between various species. What can we conclude about the evolutionary history between rabbits and humans?

• They have identical nucleotide sequences

• They develop in the same environment

• Rabbits and humans have nothing in common

• Rabbits and humans most likely share a common ancestor