HELPP!! in classifying organisms, scientists use a system that separates organisms into smaller and smaller groups based on increasingly specific and similar characteristics. If you were to sort each of your three groups into smaller groups, what criteria would you use? please help id. k this

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals