• Four unifying principles form the basis of biology.
  • The cell theory states that all living things are made up of cells, and living cells always come from other living cells.
  • The gene theory is the idea that the characteristics of living organisms are controlled by genes, which are passed from parents to their offspring.
  • The homeostasis theory is about maintaining a stable internal environment or keeping things constant.
  • The evolution theory explains how modern living things have descended from ancient life forms that no longer exist on Earth.
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