11. The study of abiogenesis involves starting material for the development of life on Earth. 12. :Stuart Kauffman has written about abiogenesis via auto catalytic sets of chemical species. 13. And there are other theories, see abiogenesis . 14. :We have an article on abiogenesis . 15. See Miller Urey experiment and Abiogenesis . 16. The topic sentence of the page is false in that it pronounces abiogenesis as a fact. 17. Finally, abiogenesis is not more hypothetical than evolution, expansion of the universe or gravity. 18. Under these criteria abiogenesis is a theory, not a fact, and should be labelled accordingly. 19. Grand Dizzy asked, on the talk page, when abiogenesis was proved to be categorically true. 20. :Since you mention the start of life you might like to read our article on abiogenesis .
