By Robin Holliday
For hundreds of years humans were questioned by means of the inevitability of human getting older. for many of the second one half the 20th century getting older remained a secret, or an unsolved organic challenge. on the finish of the 20 th century a awesome clinical discovery emerged. It used to be no longer a unmarried discovery within the traditional feel, since it was once in keeping with a chain of significant interconnected insights over relatively a protracted time period. those insights made it attainable for the first actual time to appreciate the organic purposes for getting older in animals and guy. it might probably already be stated, even if, that the various observations and insights that specify getting older usually are not accredited as proven wisdom for a very long time. the sphere continues to be choked with scientists, and non-scientists, who're simply satisfied to head on speculating concerning the 'mystery' of getting older. the purpose of this publication is to dispel lack of know-how via explaining in non-technical language what are the explanations for getting older and the parable of over the top prolongation of existence.
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Also, their mode of reproduction does not vary significantly. After a given period of gestation, offspring feed from their mothers milk, the mammary glands being the primary taxonomic feature which provides the name for the whole group. The variable features of mammals are, most obviously, their size and external morphology. This is the result of successful adaptation to habitats as diverse as the sea (whales and dolphins), the air (bats), or underground (moles). Yet all these animals retain constant anatomical features, for example, a given vertebra of a whale, in spite of the huge difference in size, has a very similar shape to one in a mouse, or in a human.
It is curious, because it is just those features of natural populations which he seized or in this theory of natural selection, that also explains the evolution of ageing in animal populations. I previously described the roundworm as a simple animal, which it certainly is, but it is also highly specialised in its lifestyle. The important point, however, is that all types of animals find themselves in hostile environments, which produce age-structured populations. For this reason, ageing probably did not evolve once, but several times in different taxonomic groups.
The weight of an animal roughly increases as the cube of its length. So a large animal such as an elephant must have immensely strong limbs to walk or run. Given its basic anatomical design, there is simply a physical or mechanical limit to the size of any species, even the fish or whales that do not have to contend with gravitational forces, have other mechanical limits to their ultimate size. Thus any animal that continued to grow would eventually reach that limit. We see this also in trees; they keep growing, but eventually if they get too large and tall, they can no longer resist wind forces and fall over.
Ageing : the paradox of life by Robin Holliday