Whilst an animal's will is adapting itself to changed conditionsof existence by the acquisition of new habits, practices, etc.
Erasmus Darwin lays great stress upon the transformation of animal and vegetable species by their own vital action and by their becoming accustomed to changed conditions of existence, etc.
Those groups progressing most rapidly and variously, and which have adapted themselves to changed conditions of existence most readily have attained the highest degree of perfection.
There are to be recognized two modes of this effect produced by changed conditions on the reproductive system, and consequently on offspring.
There is good evidence that the power of changed conditions accumulates; so that two, three, or more generations must be exposed to new conditions before any effect is visible.
Professor Hoffmann has published an abstract of a research, which consisted in subjecting plants with normal flowers to changed conditions of life through a series of generations.
It does not require to be proved that all variations produced by changed conditions of life are inherited.
Changed conditions induce an almost indefinite amount of fluctuating variability, by which the whole organization is rendered in some degree plastic" (Descent of Man, p.
But the strongest argument against the belief that self-sterility has been acquired to prevent self-fertilisation, is the immediate and powerful effect of changed conditions in either causing or in removing self-sterility.
Unless all this be done, it is impossible to know whether their self-sterility may not be due to the male or female reproductive organs, or to both, having been affected by changed conditions of life.
Changed conditions, according to Bacon (though he does not use these words), appear to be "the first rule for the transmutation of plants.
He may be said to have attributed variation to the direct and specific action of changed conditions of life, and to have had but little conception of the view which he was himself to suggest to Dr.
In the end a degree of instability in the equilibrium of one or more characters might be attained, great enough for a character to give way under a small shock produced by changed conditions of life.
In man, direct effects of changed conditions can be demonstrated (for instance in regard to bodily size), and there are also proofs of the influence exerted on his physical constitution by increased use or disuse.
He says: "These several considerations alone render it probable that variability of every kind is directly or indirectly caused by changed conditions of life.
The reproductive system can be shewn to be susceptible to an extraordinary degree (though why we know not) to changed conditions of life; and this susceptibility leads both to beneficial and to evil results.
We thus see that many of the wilder races of man are apt to suffer much in health when subjected to changed conditions or habits of life, and not exclusively from being transported to a new climate.
By his skill in constructing for himself tools and clothing and in planting his own food, man has an immense advantage over the animals, in whom a change of structure must take place in adaptation to changed conditions.
It is "probable that variability of every kind is directly or indirectly caused by changed conditions of life.
There are new or changed conditions, but either there are no abnormal ones, or all are abnormal.
In this way varieties may sometimes arise by definite and perhaps considerable leaps under the influence of changed conditions.
BU] Darwin spoke of changed conditions acting "directly on the organization or indirectly through the reproductive system.
We will now consider some other modes in which natural selection will act, to adapt organisms to changed conditions.
The direct and definite action of changed conditions.
We must ask not only do changed conditions produce an adaptative response on the part of the offspring, but whether they produce any response on the part of the offspring at all.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "changed conditions" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
