jallman said:
I have no problem with your article save that again, it is simply opinion...and very biased opinion at that. And since you wont stop parroting with the broken record of "show me scientific proof" that life does not begin at conception, let me show you what a real scientific source is made of. Of course, I know this is a wasted effort as you will simply dismiss what you cannot argue with rationally, but here goes anyway:
Source: Developmental Biology, Chapter 21 Bioethics "When does human life begin"
http://www.devbio.com/article.php?id=162
Note, this is one of 5 different views of when human life begins (all in contradiction to the conception viewpoint), promoted by science professionals across the spectrum of disciplines. And thats just outlined in this book alone. A quick web search would have answered your whinings about scientific backing for the argument for pro choice. Now that I have put up...take your planned parenthood papers, your christian focus essays and your "opining" (gee that word does have a nice ring to it) and scurry on back to the drawing board. Come back at this argument again when you can put up some comparable evidence to support your pro oppression views.
It is not surprising that out of the choices presented in your source, you would choose to accept the one which selects the date closest to birth, which, incidentally, happens to be beyond the time at which 'preemies', albeit with some difficulty, survive.
Excerpt from:
http://www.mayoclinic.com/invoke.cfm?id=DS00137
Fortunately, the outlook for premature infants has improved dramatically in recent years. Great advances have been made in the care of premature infants, and even babies born as early as 23 weeks now have a good chance of survival.
All that this argument proves is that given the limitation of the 1992 technology cited, that's the best that could be expected.
Heart beats at less than a month signify the presence of human life at that point. And, since the heart does not form spontaneously, life has to be present before the beating commenced.
Excerpt from:
http://www.drspock.com/article/0,1510,9851,00.html
The fetal heart
The embryonic heart starts beating 22 days after conception, or about five weeks after the last menstrual period, which by convention we call the fifth week of pregnancy. The heart at this stage is too small to hear, even with amplification, but it can sometimes be seen as a flickering in the chest if an ultrasound is done as early as four weeks after conception.
If you wish to 'lean' upon the source you cite, I would suggest that you consider more carefully the following excerpt from it which provides two 'views' affirming that human life exists much earlier:
Current Scientific Views of When Human Life Begins
Current perspectives on when human life begins range from fertilization to gastrulation to birth and even after. Here is a brief examination of each of the major perspectives with arguments for and against each of the positions. Contemporary scientific literature proposes a variety of answers to the question of when human life begins.
Metabolic View:
The metabolic view takes the stance that a single developmental moment marking the beginning of human life does not exist. Both the sperm and egg cells should individually be considered to be units of life in the same respect as any other single or multicellular organism. Thus, neither the union of two gametes nor any developmental point thereafter should be designated as the beginning of new life.
Another slightly different though similar position maintains that the argument over when a new human life begins is irrelevant because the development of a child is a smoothly continuous process. Discrete marking points such as the fourteen day dividing line between a zygote and an embryo are entirely artificial constructions of biologists and doctors in order to better categorize development for academic purposes. This position is supported by recent research that has revealed that fertilization itself is not even an instantaneous event, but rather a process that takes 20-22 hours between the time the sperm penetrates the outermost layers of the egg and the formation of a diploid cell (Kuhse 1988).
Genetic View:
The genetic view takes the position that the creation of a genetically unique individual is the moment at which life begins. This event is often described as taking place at fertilization, thus fertilization marks the beginning of human life. During this developmental event, the genes originating from two sources combine to form a single individual with a different and unique set of genes. One of the most popular arguments for fertilization as the beginning of human life is that at fertilization a new combination of genetic material is created for the first time; thus, the zygote is an individual, unique from all others.
Although the opinion that life begins at fertilization is the most popular view among the public, many scientists no longer support this position, as an increasing number of scientific discoveries seem to contradict it. One such discovery in the last twenty years is that research has shown that there is no "moment of fertilization" at all. Scientists now choose to view fertilization as a process that occurs over a period of 12-24 hours. After sperm are released they must remain in the female reproductive tract for seven hours before they are capable of fertilizing the egg. Approximately ten hours are required for the sperm to travel up to the fallopian tube where they find the egg. The meeting of the egg and the sperm itself is not even an instantaneous process, but rather a complex biochemical interaction through which the sperm ultimately reaches the inner portion of the egg. Following fertilization, the chromosomes contained within the sperm and the chromosomes of the egg meet to form a diploid organism, now called a zygote, over a period of 24 hours. (Shannon and Wolter 1990). Thus, even if one were to argue that life begins at fertilization, fertilization is not a moment, but rather a continuous process lasting 12-24 hours, with an additional 24 hours required to complete the formation of a diploid individual.