Download e-book for kindle: Advances in Space Science and Technology 9 by Frederick I. Ordway (ed.)

By Frederick I. Ordway (ed.)

ISBN-10: 1483199673

ISBN-13: 9781483199672

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Extra resources for Advances in Space Science and Technology 9

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Crustacea; 2. Mollusc; 3. Fish ; 4. Tadpole ; 5. Salamanders a. Ρ θ 2 b. Pco2 2. Density of ambient medium (for marine types) c · PH 2 O d · Ptotal 3. Trachea 1. Insect; 2. Millipedes 4. Book lung 1. Horseshoe crab; 2. Spider 5. Lung I. Lungfish; 2. Frog; 3. H. at Ρ θ 2 = 5-10 mm Hg. , were dead in less than 12 hr. Other aspects of this sort of ecological inversion will be discussed below, but it is sufficient to point out here that they are not uncommon. " It is, in principle, a severe procedure, but may not be so in fact.

Similarly, to choose only from the Crustacea or insecta offers great problems. —how many should be chosen? To the writer, who regards this sort of screening a rich source of information with potentially strong evolutionary significance, the only solution is to begin with some upper taxonomic group from which it is easy to work downward. The basic taxonomic system illustrated with man, an insect, and a plant is shown in Table XIII. These ranks (and intermediates such as suborder and TABLE XIIL EXAMPLES OF BIOSYSTEMATIC GROUPINGS OF ORGANISMS Name of rank Kingdom Animal Phylum Subphylum Class Order Family Genus Species Common name Chordata Vertebrata Mammalia Primates Hominidae Homo Sapiens Man Animal Plant Arthropoda Protostomia Insecta Hymenoptera Vespidae Vespa Communis Wasp Embryophyta Tracheophyta Angiospermae Rosales Leguminosae Phaseolus Lunatus Lima bean supergenus) must be recognized as a purely intellectual device of grouping organisms according to anatomical similarities and differences.

This approach presupposes that one is continuing experimentally an evolutionary trend already in process, or approximately so. Of course, an organism from any locale can be placed in any experimental environment, but this approach is likely to be somewhat chaotic. The general picture of terrestrial life, its macro- and micro-environmental conditions, and the processes of selection and adaptation have all been considered and obviously provide a guide to general ecological selection. As it was with respect to the process, the comparative approach is of inestimable value in conjunction with ecological considerations.

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


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