The study of the geographical distribution of organisms. It provides information about how and when species may have evolved., Biogeography, Homologous Structures, Molecular Similarities, Fossils, Broad groupings of organisms that already existed before the breakup of the supercontinent Pangaea tend to be distributed worldwide., Biogeography, Homologous Structures, Molecular Similarities, Fossils, Australia’s marsupial species are very diverse and fill a wide range of ecological roles. Because Australia was isolated by water for millions of years, these species were able to evolve without competition from (or exchange with) mammal species elsewhere in the world., Biogeography, Homologous Structures, Molecular Similarities, Fossils, The preserved remains of previously living organisms or their traces, dating from the distant past. Some of these species no longer exist. Some modern species don't appear to have existed in the distant past., Biogeography, Homologous Structures, Molecular Similarities, Fossils, At the most basic level, all living organisms share: The same genetic material (DNA), the same (or highly similar) genetic codes, the same basic process of gene expression (transcription and translation), Biogeography, Homologous Structures, Molecular Similarities, Fossils, Organism 2 is least related to the other three organisms because its amino acid sequence is less similar., Biogeography, Homologous Structures, Molecular Similarities, Fossils, Human and chimpanzee insulin genes are much more similar (about 98% identical) than human and chicken insulin genes (about 64% identical), reflecting that humans and chimpanzees are more closely related than humans and chickens, Biogeography, Homologous Structures, Molecular Similarities, Fossils, If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor., Biogeography, Homologous Structures, Molecular Similarities, Fossils, It's unlikely that such similar structures would have evolved independently in each species, and more likely that the basic layout of the heart organ was already present in a common ancestor of turtles and humans., Biogeography, Homologous Structures, Molecular Similarities, Fossils.

Evidence for Evolution

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