Advance in the scale of evolution along such lines as these could only be made by the emergence of creatures with more and more complicated instincts.Such beings we know in the ants and spiders.But another line of advance was destined to open out a much more far-reaching possibility of which we do not see the end perhaps even in man.Habits, instead of being born ready-made (when they are called instincts and not habits at all) were left more and more to the formative influence of the environment, of which the most important factor was the parent who now cared for the young animal during a period of infancy in which vaguer instincts than those of the insects were molded to suit surroundings which might be considerably changed without harm.
This means, one might at first imagine, that gradually heredity becomes less and environment more important.But this is hardly the truth and certainly not the whole truth.For although fixed automatic responses like those of the insect-like creatures are no longer inherited, although selection for purification of that sort is no longer going on, yet selection for educability is very definitely still of importance.The ability to acquire habits can be conceivably inherited just as much as can definite responses to narrow situations.Besides, since a mechanism is now, for the first time, created by which the individual (in contradiction to the species) can be fitted to the environment, the latter becomes, in another sense, less not more important, and finally, less not the higher animals who possess the power of changing their environment by engineering feats and the like, a power possessed to some extent even by the beaver, and preeminently by man.Environment and heredity are in no case exclusive but always supplementary factors.
What can be inferred from the example of the ant-lion in the first paragraph?
A.Instincts of animals can lead to unreasonable reactions in strange situations.
B.When it is engaged in a chain actions it cannot be interrupted.
C.Environment and heredity are two supplementary factors in the evolution of insects.
D.Along the lines of evolution heredity becomes less and environment more important.
[单选题]By education, I mean the influence of the environment upon the individual t
[单选题]By education, I mean the influence of the environment upon the individual t
[单选题]By education, I mean the influence of the environment upon the individual t
[单选题]By education, I mean the influence of the environment upon the individual t
[主观题]I shall define him as an individual who has elected as his primary duty and pleasure in life the activity of thinking in Socratic(苏格拉底) way about moral problems .
[主观题]bike on time yesterday. I mean to give it 77
[试题]bike on time yesterday. I mean to give it ______77
[主观题]B.ysuccessIdon’tmean________usuallythoughtofwhenthatwordisused.A.)whatisB)thatweC.)asyouD)allis
[问答题]()I’m now a distance education student.
[单选题]下列程序 void func1(int i); void func2(int i) char st[]="hello,friend!"; void funcl(int i) { printf("%c",st[i]); if(i<3){i+=2;func2(i);} } void func2(int i) { printf("%c",st[i]); if(i<3){i+=2;funcl(i);} } main() { int i=0;funcl(i);printf("/n");}