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Updated: May 6, 2025
Because they are so adaptive, both as regards their food and their nesting-habits. They eat both fruit and insects, and will nest anywhere in trees, sheds, walls, and on the ground. Why is the fox so cunning? Because the discipline of life has made him cunning. Man has probably always been after his fur; and his subsistence has not been easily obtained.
"You will never marry, neither for real nor ideal. You should have fallen in love in the orthodox way, when you were seventeen. You are adaptive enough to have moulded yourself into any nature that you loved, and constant enough to have clung to it through good and evil. You would have been a model wife, and a blessed mother.
An army is a unit, a flock of gregarious birds, a colony of ants or bees, is a unit because the spirit and purpose of one is the spirit and purpose of all; the unity is psychological. Only living bodies are adaptive.
The special defense reactions brought into the foreground are those which follow the line of least resistance, due to hereditary or environmental construction, or are those which were most intensely stimulated or irritated and the most biologically useful and adaptive at the particular moment or under the special circumstances.
Hence one would not expect to find changes in the cells of the thyroid gland as a result of increased activity unless it be prolonged. We have thus far considered the normal roles played by the brain, the adrenals the liver, the muscles, and the thyroid in transforming latent into kinetic energy in the form of heat and motion as an adaptive response to environmental stimuli.
In some animals this excess storage is greater than in other animals. It may be true that all animals have approximately an equal amount per kilo of chemical energy but certainly they have not an equal amount stored in a form which is available for immediate conversion for adaptive ends. Adaptive Variation in the Rate of Energy Discharge
Nevertheless, their importance has sometimes been exaggerated, owing to the adaptive characters of larvae not having been excluded; in order to show this, Fritz Muller arranged, by the aid of such characters alone, the great class of crustaceans, and the arrangement did not prove a natural one.
Looking at her aunt's hardened expressions toward death that abounded everywhere she realized that she should not expect anything new and kind in the state of Kansas. After all, humans were adaptive animals. The world was survival of the fittest, and man surviving within the perils of his environment. Why should society be structured differently?
Here, again, we have a case of modified and adaptive instinct. All animals are more or less adaptive, and avail themselves of new sources of food supply. When the southern savannas were planted with rice, the bobolinks soon found that this food suited them. A few years ago we had a great visitation in the Hudson River Valley of crossbills from the north.
Mendelism, since 1900, has studied experimentally the transmission of definite characters, and maintains that the characters of species are of the same nature as the characters which segregate in Mendelian experiments. Such characters are not in any way related to external conditions, and cannot, therefore, be adaptive except by accident.
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