[Acrylic-bob]

The bioloical imperative, the impulse to pass genes on to the next generation, exists in all living things. From the lowliest single-celled creature to the vastly more complex higher primates and is obeyed by all living things at whatever cost. This is why it is called an imperative and not an optional possibility. The Salmon, like many other animals, ceases to have any further useful function after spawning and dies, within a few hours. Humans have some life left to to them after mating solely to ensure that the young they produce are protected and nurtured until they too are ready to mate. The human body is not designed for longevity after a certain age, which is why women go through the menopause and the NHS groans under the burden of the care of the elderly, whose lives have been artificially extended by our genius beyond the normal timespan alotted to us by nature. Thus it may be argued that abortion is "unnatural" solely in that it thwarts the biological imperative.