Darwin\'s Theory had five main tenets (or components), what are they? ). These are not to be confused with the logic of Natural Selection, which is sometimes referred to as the tenets of Darwin’s theory Solution 5 major tenets of Darwins theory are : 1. The evolution stating that the world is directionally getting transformed continuously with tha passage of time, 2. The common descent which states that every group of the branching organism has decended from a common ancestor 3. The gradualism which states that during evolution, the transformation happens very gradually not at once, 4. The multiplication of species which states that the sympatric speciation leads to the diversification in species, and 5. The natural selection which states that the evolutionary change happens due to the survival of the fittest because the most fit would have a reproductive advantage, generation after generation..