Download Advances in Space Science and Technology 9 by Frederick I. Ordway (ed.) PDF

By Frederick I. Ordway (ed.)

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Possibly, with the exception of liquid ammonia, we might well be hard pressed to recognize life in other nonaqueous liquids, and the writer finds it difficult to formulate even a very hypothetical nonliquid life-form. We still, therefore, restrict these considerations to the water and aqueous systems while assuming that an ammoniacal system might well keep pace with any principles enunciated. a. The Properties of Water Virtually any elementary biology text will somewhere in its first half give one or several paragraphs to a listing of the biologically important properties of water.

6 In the Alps, differences in temperature between air and ground vary with altitude (Table VII). Plants and animals on or in the soil may be able to exist at high altitudes because of such heat absorption by soil. Soil-air temperature differentials are more marked on south-facing slopes than northern exposures and account for the well-known fact that the north- and south-facing slopes of even a small hill can differ markedly both in number and kind of life-forms present. A snow cover also helps create a less rigorous microenvironment.

The ancestry of the whale is obscure, but it is a moot point whether or not such tonnage could ever have survived on land. Nevertheless, the new medium, although buoyant, still possessed a mechanical stimulus, its viscosity. We see here retention of forelimbs but with suitable hydrodynamic modification. Furthermore, without the requirement for support against gravity, the reduction of hind-limbs to nonfunctional rudiments was in no way adverse. ELEMENTS OF SPACE BIOLOGY 31 Similar arguments apply to buoyant marine forms, in general.

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