Definition of "biogenesis"

And thus the hypothesis that living matter always arises by the agency of pre-existing living matter, took definite shape; […] It will be necessary for me to refer to this hypothesis so frequently, that, to save circumlocution, I shall call it the hypothesis of Biogenesis; and I shall term the contrary doctrine—that living matter may be produced by not living matter—the hypothesis of Abiogenesis.

1870 September 17, [Thomas Henry Huxley], “The President’s Address”, in The Athenæum: Journal of English and Foreign Literature, Science, the Fine Arts, Music and the Drama, number 2238, London: Printed by Edward J. Francis, Took's Court, Chancery Lane, published at the office, 20, Wellington Street, Strand, W.C., by John Francis. [...], page 374, columns 2–3

It is likely that the long evolutionary trajectory of Mycoplasma went from a reductive autotroph to oxidative heterotroph to a cell-wall–defective degenerate parasite. This evolutionary trajectory assumes the simplicity to complexity route of biogenesis, a point of view that is not universally accepted.

2013 March–April, Harold J. Morowitz, “The Smallest Cell [letter]”, in American Scientist‎, volume 101, number 2, archived from the original on 4 January 2017, page 83