Scientific Source #100 – Peer-Reviewed Article
“In various places we have defended the position that a new human organism, that is, an individual member of the human species, comes to be at fertilization, the union of the spermatozoon and the oocyte.” 100
![](https://whendoeslifebegin.org/wp-content/uploads/2022/01/Scientific-Source-100.png)
100 Lee P, Tollefsen C, George RP. The ontological status of embryos: a reply to Jason Morris. J Med Philos. 2014 Oct;39(5):483-504, PMID: 25223411, https://pubmed.ncbi.nlm.nih.gov/25223411.