What Did Natural Selection Do For You?
Hint: It did nothing for your origin or existence!
Darwin’s first “tree of life” sketch illustrating how speciation can happen is reproduced below. Conceptually, it remains an accurate description of speciation—including the origin of completely new life forms—by currently accepted evolutionary processes.
The branching concept (descent with modification) and natural selection are the two concepts of the Darwinian theory of evolution. The text of this diagram is provided below.
I think
Case must be that one generation then should be as many living as now. To do this & to have many species in same genus (as is) requires extinction.
Thus between A & B immense gap of relation. C & B the finest gradation, B & D rather greater distinction. Thus genera would be formed. – bearing relation (page 36 ends – page 37 begins) to ancient types with several extinct forms…
Thus between A & B immense gap of relation. C & B the finest gradation, B & D rather greater distinction. Thus genera would be formed. – bearing relation (page 36 ends – page 37 begins) to ancient types with several extinct forms…
Thus, “A,” “B,” “C,” and “D,” are species, each in their respective genus, all evolving from a generation of species “1.”