By Frederick I. Ordway (ed.)

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41 ELEMENTS OF SPACE BIOLOGY TABLE XVII. EXAMPLES OF ADVANCED STEPS IN STRESS RESPONSE Stage Plant III Leaves/buds Roots Flowers/buds General habit IV V Green/bronzed Light brown Closed Firm, upright Browning Browned Shrivelled Soft, drooping Shrivelled brown Brown, pulpy Fallen Collapsed Reduced Slow, erratic Poor Feeble, or none None None No revival Insect Activity Righting response Equilibration — — specific organisms and conditions. Specific parameters of response may be offered by the species.

All of these changes of environment were effected in single steps allowing for no adjustment or adaptation. As a tentative explanation, we believe that the stress factors which select those members of a population for a particular environment do not select for resistance to that environment, but for resistance to stress itself. Thus, a plant selected for relatively high, dry conditions may in fact be selected for its ability to correct or compensate for adverse conditions. Again, we use winter rye as an illustration ; this plant cannot only grow under water, but also in salt solutions, in heavy water, in the absence of molecular oxygen, and on diurnal temperature cycles combining a 20°C 12-hr day with a - 2 0 ° C 12-hr night.

Large members of this group are fish, molluscans (squid, octopus), and mammals. Of these, the more primitive fish—lamprey, shark, ray—have skeletons which are almost entirely unossified cartilage. More advanced fish have true bone, but are of delicate construction. The molluscan forms have no internal skeleton. Only those forms of land origin, the mammals, possess sturdy, heavily calcified bony structures. They show, therefore, the consequences, irrespective of cause and effect, of going from self-supporting land status into a viscous, dense, externally supportive medium.

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