Scientists compare the anatomy, embryos, and DNA of living things to understand how they evolved. Evidence for evolution is provided by homologous structures. These are structures shared by related organisms that were inherited from a common ancestor.
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<span>A eukaryote is any organism whose cells have a cell nucleus and other organelles enclosed within membranes. Eukaryotes belong to the domain Eukaryota or Eukarya, and can be single-celled or multi-cellular.</span><span />
<span>Cyanobacteria, which are blue-green algae, belong to the eubacterial class. Prokaryotes can be autotrophs or heterotrophs. Autotrophs like blue-green algae can make their own food, </span>