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Originally Posted by Og  You won't tease out anything specific about this topic other than what we know about current state of related species, some examples of fossilized older versions of the creature, and what we know about the molecular genetics of the systems involved (quite a lot).
What kind of studying are you doing on the topics of related species construction and survival, fossilized records, or genetics of this system?
Until you make some headway there, you're not going to be enlightened much at all about the topic you're asking about.
I can say that the concept of natural selection would indicate that if they didn't avoid the water, they'd die (whatever it is that you're talking about here). The ones that survived would reproduce. There was no "managing" about it. The point is that the ones that were successful then reproduced. This is an observable feature of biological systems today.
I don't know the specifics of what you're asking here, but this is analogous to bacteria being selected by an antibiotic. If the bacteria somehow have resistance to the antibiotic, they survive. If they don't, they die. This is how features adapt. Selective pressures rectifying mutations. |
THE GNAT
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GETTING OUT OF THE EGG
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When the incubation period is completed, larvae start to get out of their eggs almost concurrently. The first egg is immediately followed by the others. After that, all of the larvae start to float in water. The larvae, which feed continuously, grow in a short while. Soon, their skin becomes too tight so as not allowing them to grow any further. This indicates that it is time for the first skin change. The hard and brittle skin easily breaks down. Until the development is completed as a whole, the gnat larva is to change its skin two more times.
The method used for the feeding of the larvae is rather impressive. The larvae make small whirlpools in the water with their two fan-shaped extensions made up of feathers, and thus make bacteria and other micro-organisms flow towards their mouths. The respiration of the larvae is provided by an aerial tube similar to the "snorkel" used by divers. They repose upside down in the water. A viscous secretion secreted by their body prevents water from leaking into the openings through which they breath. Briefly, the animal lives with the cooperation of many delicate balances. If it did not have an aerial tube, it could not survive; if it did not have a viscous secretion, its respiratory tube would be blocked.
In the mean time, most of the larvae change their skin once more. The last skin change is rather different from the others. With this last change, larvae pass onto the final stage of their maturation, the "pupal stage". Now, it is time for the larvae, which are sufficiently grown in the larval skin, to get rid of this shell.
However, such a different creature gets out of the shell that it is indeed hard to believe that these two are different developmental phases of the same being. And this metamorphoses is far too complicated and delicate to be designed neither by the larva itself, nor by the mother or any other living thing...
During this latest stage of metamorphoses, the animal faces the danger of being choked, as its respiratory openings rising above the water through an aerial tube are to be closed. However, from that stage on, respiration is not to be done through these holes, but through two tubes newly emerging on the anterior of the animal. This is why these tubes rise to the water surface firstly prior to skin change. During the three or four days long pupal stage, no feeding takes place.
Now, the gnat within the pupa cocoon is mature enough and has taken its final form. The gnat is ready to fly with all its organs and organelles like antennas, trunks, feet, chest, wings, abdomen and large eyes.
Gnats at their pupal stage
The pupa cocoon is torn at the top. This stage where a complete gnat emerges is the most fatal stage of all. The greatest risk at this stage is the leaking of water into the cocoon. However, the torn top is covered with a viscous liquid preventing the gnat’s head from contacting water.
The gnat has to get out of its cocoon without having any direct contact with water. Only its feet touch the water surface. This moment is extremely important, as even a soft wind may cause its death. The gnat, which gets out of its cocoon, leaves for its first flight after a rest of about half an hour.
The animal has got out of water without even touching the water...
At this point, we have to ask: How come the first gnat had attained the "ability" to go through such a metamorphosis? Might it be that a larva has "decided" to transform into a gnat after changing skin three times?
Absolutely not; it is quite evident that this tiny animal which Allah gives as an example, has specifically been created as it is.
While the gnat gets out of water, its head should not contact with water at all, because, even one breathless moment may result with the choking of the gnat. Therefore, even a breeze or a tiny roughness on the water surface may be fatal for the gnat.
HOW GNATS PERCEIVE THE OUTSIDE WORLD
Gnats are equipped with extremely sensitive heat receptors. They perceive things around them in different colours depending on their heat as in the picture on the right. As this perception is not dependent on light, it is quite easy for the gnat to spot the blood vessels even in a dark room. The heat receptors of the gnat are sensitive enough to sense heat differences as small as 1/1000 C degrees.
The gnat has nearly 100 eyes. These eyes are placed as compound eyes on the top of its head. In the picture above, the cross-sections of three of these eyes are shown. On the right, it is shown how the image of an object is transmitted to the brain from the eye.
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AMAZING TECHNIQUE OF BLOOD SUCKING
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Sting Sheath
The gnat’s technique of "blood sucking" is unbelievably amazing.
After the gnat lands on its target, it first detects a spot by using the two devices around its mouth. The syringe-like sting of the gnat is protected with a special sheath, which is stripped off during the blood sucking process.
The gnat does not prick the skin by thrusting its sting into it with pressure as assumed. Here, the duty falls to the upper jaw which is as sharp as a knife, and the mandible on which there are teeth bent backwards. The mandible is moved forwards and backwards like a saw and the skin is cut with the help of the upper jaws. When the sting inserted through this cleavage on the skin reach to the blood vessel, the drilling ends. Now it's the time for the animal to suck blood.
However, as known, in the slightest harm made to the vessels, the human body secretes an enzyme that clots the blood and stops its shedding. This should be a great problem for the gnat, because the body would also react to the tiny hole opened by the gnat, therefore, the blood would be clotted and reparation would start. This means that the animal would not be able to suck any blood.
But the problem is specially eliminated for the gnat. Before the animal starts sucking blood, it leaves a special liquid secreted in its body into the cleavage opened in the human vessel. This liquid neutralises the enzyme that provides for the clotting of the blood. Thus, the gnat sucks the blood it needs without any problem of clotting. The itching and swelling of the spot bitten by the gnat is caused by this liquid which prevents clotting.
This is surely an extraordinary process and it brings the following questions to the mind:
1) How does the gnat know that there is an clotting enzyme in the human body?
2) In order to produce a neutralising secretion in its own body against that enzyme, it needs to know the chemical of the enzyme. How can this be possible?
3) Even if it somehow attains such a knowledge (!), how come can it produce such a secretion in its own body and constitute the "technical rigging" needed to transfer it to its sting?
The answer is obvious; It is not possible for the gnat to perform any of those above. It neither has the required wisdom, nor the chemical knowledge, nor the "laboratory" environment to produce the secretion. What we talk about is only a gnat of several millimetres without any wisdom or consciousness, that's all!…
It is quite clear that it is Allah, "Lord of the heavens and of the earth, and of all that is between them", who has created both the gnat and the man, and donated the gnat with such extraordinary and marvellous features.
Whatever is in the heavens and on earth,- let it declare the Praises and Glory of Allah: for He is the Exalted in Might, the Wise. To Him belongs the dominion of the heavens and the earth: It is He Who gives Life and Death; and He has Power over all things.(Surat al-Hadid, 1-2)
When it is considered that apart from the excellent systems of the gnat such as feeding, reproduction, respiration and blood circulation, this lice also has complex systems and organic functions, the boundlessness of the signs of Allah can better be comprehended.
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