Embryology textbook quote: T.W. Sadler's 'Langman's Embryology' — the zygote is an independent new organism

Mike cites T.W. Sadler's 'Langman's Embryology': 'The development of a human being begins with fertilization, a process by which the spermatozoon from the male and the oocyte from the female unite to give rise to a new organism, the zygote.' The quote explicitly calls the zygote 'an independent new organism.'