Evolution theory explains how organisms have changed over time.
Scientific understanding requires both facts and theories that can explain those facts in a coherent manner.
Evolution, in this context, is both a fact and a theory. 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.
There are four major patterns of change.
Patterns in Nature
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.
(Thanks for IFAS, Jodhpur)
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