Combining Texts

You have chosen 'Homeostasis, Species and Higher Taxa' by Richard Boyd, 'Notes on Comments by Fardella' by Gottfried Leibniz and 'New System and Explanation of New System' by Gottfried Leibniz

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge