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Therefore, assuming that the role of natural selection in the modification andthe formation of the primitive units were extremely active and that the experiencethe fittest is widely served as an instrument for processesenabling and managing connection of these units initially, small, andthen in a large visible organisms, we still need to attributethe appearance of this the General properties of organisms directly exposedenvironment for primitive life forms and recognize that the universal factornatural selection only took advantage of this environment. We now turn to another, more obvious, features of the highestorganisms that occurred from the most common causes. Consider howway in the higher levels of the organization repeats this differentiationthe outer parts from the inner - how this initial hellorganisms that begin life again appears as the mainfeatures in the microscopic connections of individuals that formvisible organisms. We see the simplest and most obvious manifestation of this trait inthe developing egg of a primitive type. The original singlethe fertilized cell, rastrogavshis by spontaneous cleavage ina group of cells starts to detect the contrast between periphery and centre,after the balloon formed, consisting of the outer layer and different fromthe internal mass. Therefore, the first change is the emergence ofthe difference between the outer portion having direct communication with the surroundingenvironment, and internal, completely isolated from such communication; but thiscomplex differentiation in the embryos of higher animals is parallelprimeval differentiation, which was exposed to protozoa. Leaving on time, subsequent changes in the complex germ, valueof which we understand little by little, we turn now to the adult forms of visibleof plants and animals. In them we find these basic features, who, afterthe foregoing will further convince us of the importance of the action of the environment on the organism.
Therefore, in this case, the surf and the tide made a selection andeach place left behind those stones that were too large for moreeasy movement, but was postponed ahead of the other, a small,easier roaming. But if we were to consider only thisthe nature of selection, the action of the sea, we would have missed some importantmoments that occur when such activities sea. When the stonesunderwent so a different effect is because of him that somewas left in one place and others in another, they stillreceived two acting jointly, but not identical effects. Constantlymoving rocks and causing a friction of them against each other, the waves are so grindthe most outstanding parts that gave them a more or less rounded shape;in addition, in turn, the mutual friction of the stones, polished themsurface. In other words, the impact of environmental conditions insofarbecause they influenced monotonous, gave the stones are remarkable for the unity of forms, andat the same time, due to the difference of their influence, they are separated one from the stonesother larger stones did not yield known strong influenceswhich smaller stones could not resist. The same can be said about the other groups of subjects that are similarthemselves in General terms, but different in the secondary. When theyall are collectively known group influences, we can expect thatsome of the latter, reaching a certain degree of intensity, will beto call in some of the individual items of such groups changes, which theynot able to call in other subjects different from the first. Meanwhileother exposure may cause all objects similar changesdue to the monotony of the relations between these effects and knownqualities common to all members of the group. This suggests thatliving organisms that constitute a homogeneous group of subjects, and all thecontinuously exposed to agents, their constituent inorganicthe environment must also undergo two of the same number of effects. Hereoccurs, on the one hand, their universal similarities, originating from thethe sameness of their relationship to the substances and forces of the external environment, and on the otherside occurs in some cases, the difference between them, depending onexposure to these substances and forces; in other cases changes occurwhich, while preserving or destroying life, are a famous naturalselection.
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