To be more specific: A living thing metabolizes. Even if he is right and you are wrong, he has demonstrated unequivocally that you succeeded as a storyteller. An oyster may lie attached to its rock all its adult life, but it can open and close its shell. The protective mucus our own stomachs use is only one of the possibilities. It is still defensible to build for story purposes a creature that drinks hydrazine, and say that no one can prove this impossible. An adult human being no longer grows and many individuals never have children, but we still consider them alive even though they no longer grow and do not reproduce. The ears have thick fur on both the inside and outside.
It is still defensible to build for story purposes a creature that drinks hydrazine, and say that no one can prove this impossible. It is, however, by far the most likely, assuming the planet in question has a sun. Remember, though, that among your readers there will be some who enjoy carrying your work farther than you did. The former can run much more energetic reactions than even oxygen, while chlorine compares favorably with the gas we are all hooked on. I suspect it would need a very strong cell wall, but why not? It may have to be subjected to chemical change so that large and complex chemical units molecules are converted into smaller, simpler ones. By this we mean that it can eventually convert material from its environment into its own substance. Things like strength of muscle and rate of chemical and heat exchange with the environment depend on surface or cross-section area, and change with the square of linear size; Swift's Brobdingnagians would therefore have a hundred times the strength and oxygen intake rate of poor Gulliver. Plants, too, can move, turning their leaves to the sun, for instance; and there are continuous movements in the substance making it up. It is neither possible nor desirable to do everything for him. The genus Phascolarctos split from Litokoala in the late Miocene   and had several adaptations that allowed it to live on a specialised eucalyptus diet: Temperatures assume the planet has about 1 atmosphere worth of pressure. Will there come a point when machines will be complex enough and flexible enough to reproduce the properties of life so extensively that it will become necessary to wonder if they are alive? Unlike typical mammalian vocal cords , which are folds in the larynx, these organs are placed in the velum soft palate and are called velar vocal cords. This, however, is not much of a science fiction problem. The giant amoeba is a familar example; monster insects or whole populations of them even more so. If someone takes exception to the statement that muscles can only pull, by all means do something about it. Wheeled metallic natives of Quopp artwork by Jack Gaughan In the first case, the qualities of the various life forms have to a considerable extent already been determined; they are demanded by the story events. The open flame is an exceptional condition. The entropy decrease is more than balanced by the entropy increase in the energy source, but that is beside the point here. A living thing can sense and it can respond adaptively. The need for an internal skeleton stems largely from the nature of muscle tissue, which can exert force only by contracting and is therefore much more effective with a good lever system to work with. Additional climbing strength is achieved with thigh muscles that attach to the shinbone lower than other animals. Since one sign of decreasing entropy is increasing organization that is, an increasing number of component parts interrelated in increasingly complex fashion , it is not surprising that living objects generally are more highly organized than their nonliving surroundings. We must therefore look at the properties of life more deeply, and the key lies in something stated earlier:
Video about determining the sex of a sugar glider:
Male and Female
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