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...Khan academy science biology library evolution and the tree of life natural selection evidence for anatomy molecular biogeography fossils direct observation key points comes from many different areas species may share similar physical features because feature was present in a common ancestor homologous structures dna genetic code reflect shared ancestry comparisons can show how related are global distribution organisms unique island geological change document existence now extinct past that to day we directly observe small scale with short lifecycles e g pesticide resistant insects introduction is unifying principle as theodosius dobzhansky once said nothing makes sense except light but what exactly make more through put it another way indications or traces lens has taken place still happening today happens on large scales before look at let s sure same page about broadly speaking makeup often heritable population over time biologists sometimes define two types based macroevolution whi...