Pandora's star animals that have "hexapod"

Pandora's star animals that have "hexapod"?

Beijing News weekly of the new knowledge

Extraterrestrial organisms have always been enthusiastic about the performance of literary and artistic works.

The ' where da "describes the various" hexapod "Pandora's star monsters. Then, on Earth, why did not the large terrestrial animals gave birth to six foot? some people discuss the origins of the limbs, must first discuss how it can adapt to the terrestrial life — legs to walk, the number of legs seem to walk than optimal results. As for why four legs also optimal, but who can't prove that cannot refute.

The nature of the situation seems to be not so perfect, some characters don't seem to have no effect ...

Why do they appear? for the simple reason that they are historical. Evolution is not the inventor, not fabricated out of a set of new things. It's more like repairing Carpenter, although occasionally lingguang Flash, most of the time or robbing Peter to pay Paul. Therefore, it might not be a born limbs to walk, but other organs due to environmental change and misappropriation, as human ossicle originally belonged to the lower jaw, bat's finger membrane acts as the wings, or Panda's carpal into additional "thumb". If this is true, the number of legs and walking distance doesn't matter.

Fact it seems so.

Echinotriton (Acanthostega) is the earliest known one of the four-legged animal, but it seems to be totally unsuitable land travel: no wrist and ankle, cannot like are bent as protozoa; limbs elongated, bear much weight; ribs to support internal organs; there is also a thick tail, it also has osteoporosis of fins. Most importantly, it is similar to the gills and fish. In fact, now scholars tend to think that although it had a limb, it is still living in lush vegetation in shallow water. No one knows it why grow physically, but certainly has nothing to do with the "walk". Then look to, in fact, the "four-legged" and "four" is not derived from four-legged animals. Their leg bone from the side of the fin fish, and the number of lateral fin is four (including a pair of pectoral fin and a pair of fins). They appear conducive to the coordinated fish movement. As for why is two pairs, and now think this is probably caused by a developmental mechanism casually results. As early as the animal on land of 100 million years ago, this figure has been accidentally set.

Seen this, why is the "Pandora animal hexapod" problem solved.

They consist of hit N common ancestors years ago, has been a "six-legged creature". However, you see here may also have to wonder: since then, and they are the same in a planet's Neville people why only limbs? there exist three possibilities:

First of all, they probably originally "Hexapoda", but there are two-leg degradation.

Degradation cause I don't know, after all, I do not know Pandora star geology and environmental history (mining company will certainly bring a large group of geologists, but refused to tell our trade secrets). X-rays are also likely to find two limbs of the wreckage, and Neville human embryo will leave marks, like our embryonic development also leaves Gill remains the same.

Secondly, they may and other organisms from different evolutionary lineage.

Mankind's understanding of his own planet are not deep, newcomers to on Pandora's star eco picture misleading also very normal. What's more, Neville and other biological similarity is limited: the animals mostly body covered with thick or flake, not fur or feathers, is clearly modelled on the design of reptiles. This hypothesis is also very easy to verify through comparative anatomy. Of course, whether cooperation Neville that other things ...

Finally, producers may find that if the person is Neville Hexapoda, then whatever is "hands four-legged" or a "four hands and two feet", it is very difficul

t to grab the appropriate action. And let the human organism with "hexapod" love marriage, I am afraid it is very difficult to give the audience what good impression.

□ Entre (Beijing paleontology)