The diagram shows embryo development of four different animals how is this evidence used to suggest that life changes over time a. these stages indicate that animals within a species must have changed over time. b. the dna of all these life forms begins exactly the same and then changes over time as it replicates to produce the organisms different traits. c. late-stage embryonic development illustrates how acquired characteristics have caused these species to become more differentiated over time. d. striking similarities at early development stages is evidence that they came from a common ancestor.