Ah, but the response is ordinarily adaptive, for it is toward the light. In general, we are usually safe in supposing that any change which is produced against a resisting force, or any change that alters something relatively simple to something relatively complex, or that alters something relatively disorderly to something relatively orderly, decreases entropy, and that none of these changes will take place spontaneously.
Substitutes for free oxygen in energy-releasing reactions are perfectly possible chemically, and as far as anyone can tell should be possible biologically indeed, some Earthly life forms do use other reactions.
We have the fact that on Earth, with silicon many times more plentiful than carbon, life uses the latter. The human species has, as a matter of fact, done a rather impressive job of overcoming its sensory limitations, though I see no way of ever being sure when the job is done.
Also, the horse would have to extract a great deal more energy than it does from its hay diet to power the flight muscles even if it could find room for them in an equine anatomy. Furthermore, it sucks water into its organs and strains out food, so that there are parts of itself that move constantly.
Of course, a story could be built on the unfortunate consequences of the rnen who were mowed down by what they thought must be a death ray, when the welcoming committee was merely trying to take a good look… Sound does have the advantage of being able to diffract around obstacles, so that straight-line connection is not needed; light that is, light visible to human beings is of such short wavelength that diffraction efiects are minor.
This leads to a point which should be raised in any science fiction essay. Thus, a rock can be pushed uphill; water can be separated into hydrogen and oxygen again by an electric current; a spring can be tightened by muscular action, and iron rust can be smelted back to iron, given sufficient heat.
Anyone with the slightest trace of intelligent critical power can find a way around most of these dicta by setting up appropriate situations. What about life forms radically different from ours, based on altogether different kinds of chemistry, living in completely hostile to us environments?
The material may not be fit for use to begin with, so it must be broken apart, moistened, or otherwise treated. A seed does not move, or seem to sense and respond—yet give it the proper conditions and it will suddenly begin to grow. There is absolutely no way to tell at present. It is permissible and even desirable to take the reader by surprise with some of these details, of course.
Could there be an ammonia-based life, in place of our own water-based one, on a cold planet like Jupiter?
There seems reason to believe that at least with Earthly biochemistry, the first and last of these weaknesses do not favor intelligence.
Nevertheless, what we call "life" is sufficiently important to warrant an attempt at a definition. That last seems a justified assumption about the present readers.
DeCamp reached the conclusion that an intelligent life form would have to wind up not grossly different in structure from a human being—carrying its sense organs high and close to the brain, having a limited number of limbs with a minimum number of these specialized for locomotion and the others for manipulation, having a rigid skeleton, and being somewhere between an Irish terrier and a grizzly bear in size.is and in to a was not you i of it the be he his but for are this that by on at they with which she or from had we will have an what been one if would who has her.
Great Expectations - Charles Dickens "I think it was the first time I had felt such a bond with a character. I triumphed with [Pip's] successes, felt the blow of failure in his defeats, and felt sorrow when he broke his own principles. ค้นพบ Link ทั้งสิ้น รายการ 1.
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