Evolutionary dating methods do guys take online dating seriously
The field of evolutionary biology seeks to provide explanations for four conspicuous patterns that are manifest in nature.
The first three concern living species, whereas the fourth relates to fossils.
While progress has been made in this area, the origin of life remains an interesting, but unanswered, question.
Biological evolution results from changes over time in the genetic constitution of species.
Evolutionary biology provides a scientific framework for understanding the changes that have occurred since the first life forms arose on Earth several billion years ago.
Biochemists, geologists, and physicists seek natural explanations for the origin of life on Earth.
Hence, evolution is both a theory and a set of established facts that the theory explains.
Evolutionary history is represented as a branching tree, with shorter or longer links between all species depending on their relationship.
One of the most difficult, but important, points to understand about evolution is the tremendous age of the Earth.
It is an incontrovertible fact that organisms have changed, or evolved, during the history of life on Earth.
And biologists have identified and investigated mechanisms that can explain the major patterns of change.
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The fossil fish Priscacara liops found in sediments dating from the Eocene epoch (55.8 ± 0.2 to 33.9 ± 0.1 mya) in present day Green River, a tributary of the Colorado, USA. Scientific understanding requires both facts and theories that can explain those facts in a coherent manner.