Evolution occurs rapidly enough to be observed in a lab flask. Biologists document the evolution of a virus into 2 incipient species, a process known as speciation that Darwin proposed to explain the branching in the tree of life, where 1 species splits into 2 distinct species during evolution.

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Evolution occurs rapidly enough to be observed in a lab flask. Biologists document the evolution of a virus into 2 incipient species, a process known as speciation that Darwin proposed to explain the branching in the tree of life, where 1 species splits into 2 distinct species during evolution.