There is a whole litany of valid scientific reasons that unborns are not parasites...it is a whole field of study and the reasons are to numerous to post because I don't have time to type such a long list... I gave seven reasons up in post #199....what is funny, in a very sad way is that fedor50 began this thread claiming that zygotes were not even organisms and now he is calling them parasites and I doubt that even someone as intellectually twisted as him could make the case that a parasite, even if that were what a zygote is, is not an organism....
In his biological ignorance he also misses the blatant fact that a zygote does not take anything at all from its mother...it is free floating and is living off the nutrients that were present in the egg. It will be well past the zygote stage of development before it implants and begins to use nutrients supplied by its mother. His argument is so fundamentally flawed that it would be funny if it were not an attempt to defend the largest genocide in human history.
I'm just going to quote from the end of the page here. I've been looking into the topic of abortion for a while now since middle school (now 17) and what I learned from school, by the very basic law of biogenesis we know that the offspring of two humans must be of the human species. It can't be a cat or a dog or a monkey or something. It has to be a human and nothing else. I also know that where you are doesn't determine what you are. A newborn human is a human just like I am a human. The newborn human is smaller then me, less developed then me, in a different location, and more dependent then me. We don't use any of those things to determine a entities species membership.
Anyways here is some information from my moms embryology textbooks that all agree that a human begins to live at fertilization.
''The scientific answer is that
the embryo is a human from the time of fertilization because of it's human chromosomal constitution. The zygote is the beginning of a developing human.''
Keith L. Moore, T.V.N Persaud, Mark G. Torchia, Before We Are Born: Essentials of Embryology, 8th edition. Philadelphia, PA: Saunders, 2013. p.327
“Fertilization is the process by which male and female haploid gametes (sperm and egg) unite to
produce a genetically distinct human individual.”
Signorelli et al., Kinases, phosphatases and proteases during sperm capacitation, CELL TISSUE RES. 349(3):765 (Mar. 20, 2012)
“
A Humans life begins at fertilization, the process during which a male gamete or sperm (spermatozoo developmentn) unites with a female gamete or oocyte (ovum) to form a single cell called a zygote. This highly specialized, totipotent cell marked the beginning of each of us as a unique individual.” “A zygote a new human'' (i.e., an embryo).”
Keith L. Moore, The Developing Human: Clinically Oriented Embryology, 7th edition. Philadelphia, PA: Saunders, 2003. pp. 16, 2.
“In this text, we begin our description of
the developing human with the formation and differentiation of the male and female sex cells or gametes, which will unite at fertilization to initiate the embryonic development of a new individual. … Fertilization takes place in the oviduct … resulting in the formation of a zygote containing a single diploid nucleus. Embryonic development is considered to begin at this point… This moment of zygote formation may be taken as the beginning or zero time point of embryonic development.
Essentials of Human Embryology, William J. Larsen, (New York: Churchill Livingstone, 1998), 1-17.
“The
development of a human begins with fertilization, a process by which two highly specialized cells, the spermatozoon from the male and the oocyte from the female, unite to give rise to a new organism, the zygote.''
Langman, Jan. Medical Embryology. 3rd edition. Baltimore: Williams and Wilkins, 1975, p. 3
See how I put them in that order year wise from the newest to the oldest one I could find? For well over 40 years in the fields of biology, phylogeny, organism life, genetics-DNA, anthropology, human embryology are all in scientific consensus that the unborn are humans throughout all stages of development. You either are a human from the zygote stage or you never are. Nothing more to say to that.
That's the problem with some pro choice people (not all pro choicers) on the wing though, is that they can employ subterfuge in their argumentation, complete with sophistry, to blur the very real distinction in terms and to run from the biological reality that abortion kills a human (the noun obviously lol) everytime by hiding with the emotion of it via intellectualizing.
ONCE when pro choicers can accept the fact the unborn are humans just like the rest of us, the personhood debate can then finally begin. Should humans be considered persons based on what they are? Or should they be persons based on various mental characteristics like theory of mind, rationality, sense of self, functional IQ etc.