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By 1860, what percentage of the U.S.population lived west of the Appalachians?
Regressive Hypothesis
A theory suggesting that more complex systems or structures have evolved from simpler precursors through a process of simplification or loss of features.
Virus-first Hypothesis
A theory proposing that viruses existed and evolved before the emergence of cellular life forms.
Nucleic Acid Core
The central part of a virus particle, containing its genetic material, which consists of either DNA or RNA.
Capsid
The protein shell that encases the genetic material of a virus.
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