Whoever remains in a position neutral adopts a cautious approach by not having enough information. He who opposes it shows their ignorance or more supine or lying blatantly. In both latter cases the motive for criticism is the religious thought of the kind or nature.
The fossil record
First, the fossil record remains well located some evidence, very important, changes. Among the hoofed mammals and are odd or even fingers to artiodactyls, "finger (Dactylo) par (Artie), and Perissodactyla" finger (Dactylo) odd (Periso). " In the latter group includes for example the horse. You can follow their fossil record almost entirely with virtually all stages of evolution since until the Eocene period some 56 million years. Among its first representatives met a dog like animal, which was gradually reduced over time the number of fingers and extending his limbs and neck. And not only can we speak of the fossil record with respect to the horse, but in general the rest of the Perissodactyla (rhinoceroses, tapirs and horses). Thanks to paleontology and geology has been linked seamless interconnection between temporal ecosystem of these beings and their biological expertise. Initially, a larger number of smaller fingers and was favorable for grazing leaves tender in wooded areas of soft ground, subsequent evolutionary changes also coincided with new robust forms were accompanied by more open landscapes, vegetation is heavy and hard and firmer ground.
The fossil record also provides additional key information for understanding the evolution of species. Other living raise serious evidence in their favor, such as in the clear cases of certain whales and snakes that remain in the skeleton remains of the past. Two adequate specimens for study demonstrate without any doubt that in the distant past walked the earth. The whale, meanwhile, belonged to the order Artiodactyla and has been shown that genetically keep a common ancestor with hippos. Skeletal remains of hind legs and the unique configuration of your ear, which have caused several evolutionary stages analysis over time and served in adapting to the new water environment, and their classification of mammals undeniably relational . For its part, the first snakes had legs and dug into the ground. Even today we can find pins endoskeleton which is not waste at all of the hindlimbs.
These tests are therefore undeniable, and it is not permissible criticism of the incompleteness of the fossil record. It is not tolerable the view that only some beings might experience some changes, but that evolution is general and absolute for all species, while every day each and every one of the remains found and studied, and spend to integrate the fossil record, have this feature. That is why testing is still incomplete undeniable and can not be disputed, the truth of evolution, which long ago ceased to be a theory to become a palpable fact.
How does evolution. Example albino siblings.
Although generally teaches that animals adapt to their environment, this statement is not necessarily concise review acceptable and deserves respect. There is no intelligent gene that modifies the genetic chain of each species in order to facilitate their survival in certain environments. The reality is that these changes are almost random and the vast majority of cases, negative. And always involuntary.
In the replication process of the spiral of DNA, the enzymes that work committed errors of identification and location of copies. Contrary to what can be heard, nature is not perfect, but this flaw could also be seen as its greatest virtue since without it a fairly hostile environment would stop short the chances of survival of the species and our planet would be today without terragal interest.
Sometimes these errors in identification and location of replicas of one of the bands of DNA (the corresponding enzymes and separate them into two duplicate), mutations occur, ie a specific number of genes unwilling cause considerable changes in assessment. Some are insignificant, others are aggressive and death sentences for the individual, and in some cases and in a very minor rate positive. The negative change fails, the other positive, that is why what we have on earth today is the result of a string of positive change. This is the law of the strongest, more or less, applied to the full extent required.
suppose To better understand an environment that due to geological disturbances becomes hostile. Any variable in this environment much influence on the outcome. Two groups of animals like lions live peacefully in large areas of savanna, but the effects of ice forces them to narrow their differences in pursuit of already scarce food, bison drink together in a particular area further south where the cold is running up with the hopes of many species. Female hunters are forced to fight battles with the enemy on the other side almost daily. However, two years ago, a lucky mutation has affected two pups (one male and one female) herd of one side. The offspring are albino (remember cases like tigers and gorillas in the Zoo of Jerez and Barcelona for example), slightly larger and therefore more strength. Withstand the cold better in the decreasing extent of the savanna and to compete for food physical strength is vital. The male soon left the group and he joined other far that has little hope. His skills make him the leader in no time. The female on the other hand, will stay and mate with the dominant male crossbred giving birth older than the existing physical fitness and better adaptation to climate. Both brothers have triumphed in their respective groups, the trough between the rivals some up and others die from various causes stemming from new biological and climatic situation. The species is blurred.
A new stage of evolution was born. Lions albinos or semialbinos, stronger, better adapted to an environment that because of this unintentional enhancement of the genetic code is not as hostile, are living proof of evolution. These features, together with a slight expand, will join the fossil record millions of years later. Due to increased energy needs, making the species renewed southward where food is more abundant. Circumstances force them to adopt a nomadic lifestyle in a few generations separate them thousands of kilometers. The evolution continues, but now separately and the two other subgroups born groups with marked differences due to mutations inevitably suffer. When intelligent beings study million years after the fossil record, including today find as many differences as we find ourselves between a horse and a zebra, or between a zebra and a hippo. But their common ancestors.
Human Evolution and disasters
think so anthropocentric can lead us into the mistaken idea that the world is as it is because it has a clear goal, and this is the first step to attribute to supernatural forces the origin of life or the existence of all things. It is not that being here is special and therefore requires a spiritual assessment, but if we are talking about it is because we have survived. Why are we still here if it works with this randomness?. Simply because if existiésemos could not ramble on about the same issue. Doing so is a consequence, not a motive.
probably in many other parts of the vast cosmos have not so lucky, in others yes. Major disasters test the speed and effectiveness with which monetary developments and the adequacy of our vital ecosystem. Geologically unstable environment it would not have allowed some licenses that have enjoyed in the past. However, the mass extinction has been and always will. At the end of the last ice age killed a large proportion of living species, although some were better adapted and survived. The man, including, but other genetic variations hominids did not succeed in their past, such as Neanderthals and others in earlier times.
In fact, our direct ancestors are extinct. Erectus, habilis and others did not survive over time probably because the human peculiarities did not allow the coexistence of various stages simultaneously, or perhaps because the particularities of some peers made them more apt to procure and food security. Tested the enormous difficulties we had in the past to go forward. In fact, some key events were almost miraculous, as the transformation into a bipedal species. Again led geological events such circumstances, the major changes occur in the terrain of Africa. The tree species were forced to get to the other side or stay isolated. And that other side was different, with no predominance of forest, so that those who managed to get up and look around on the half-height vegetation flourished further. Other causes are joining this important change, some of great importance.
However, if an asteroid or comet like the many that hit the earth over its history, had fallen into a particular area of \u200b\u200bAfrica we would not be here rambling on about this issue. Why is there no possibility that touched us?. On two key issues: the fate and time.
In the first case, the planet is relatively large and lived in very specific locations, especially larger towns. In times of our ancestors many stars hit the planet but we are talking about a question of statistics, probability.
The second case corresponds to the undeniable reality that the number of bodies on a collision course is much lower now than 100 million years ago. A massive body in the distant stage of accretion in the solar system almost destroyed the Earth 3,800 million years ago, but this period of cosmic virulence ended long ago. Every time a star struck us, was a planet, a comet or an asteroid, the replication catastrophe reduced due to the decrease in the number of them. Why not ask the reason why the man lived 60 million years ago?. Had it been possible by drastic changes throughout the system obviously would have perished as did the dinosaurs and many other species in the mass extinctions in history. If we now here is because the time has reduced the potential for massive impact, or at least significant. If today we had the misfortune of that fact should occur, perhaps within 50 million years another thinking creature is to make the same question: why us?.
Spirituality and philosophy
In that case, probably some of its members raises some kind of divine will, that they were not favorable to past hominid species. The reptile deity (why not?) Have selected the descendants of the snakes for some strange reason.
forgive the mistakes of this essay.
