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I think many can agree that if a fetus is viable on its own then an abortion would be a very questionable thing.
Why are you creating an arbitrary definition of human life. Don't you believe in science?
Science tells us it is a human being.
“….it is scientifically correct to say that human life begins at conception.” Dr. Micheline Matthews-Roth, Harvard Medical School: Quoted by Public Affairs Council
After fertilization has taken place a new human being has come into being...[this] is no longer a matter of taste or opinion, it is not a metaphysical contention, it is plain experimental evidence...." - Dr Jerome LeJeune, Professor of Genetics at the University of Descartes, Paris, discoverer of the chromosome pattern of Down's Syndrome, and Nobel Prize Winner, Report, Subcommittee on Separation of Powers to Senate Judiciary Committee S-158, 97th Congress, 1st Session 1981
"An individual human life begins at conception when a sperm cell from the father fuses with an egg cell from the mother, to form a new cell, the zygote, the first embryonic stage. The zygote grows and divides into two daughter cells, each of which grows and divides into two grand-daughter cells, and this cell growth/division process continues on, over and over again. The zygote is the start of a biological continuum that automatically grows and develops, passing gradually and sequentially through the stages we call foetus, baby, child, adult, old person and ending eventually in death. The full genetic instructions to guide the development of the continuum, in interaction with its environment, are present in the zygote.
Every stage along the continuum is biologically human and each point along the continuum has the full human properties appropriate to that point." Dr. William Reville, University College Cork, Ireland.