真相大白的意思是什么意思 “蛇为什么没有脚”真相大白

“蛇为什么没有脚”真相大白  

The Mystery Of Why Crafty Snakes Shed Their Legs Is Finally Solved
Mention snakes and the image that es to mind is that of a stealthily gliding reptile. Turns out that this was not always the case. Ancient snake fossils indicate that the reptiles once had legs
just like the rest of us. So why did snakes decide to shed them in favor of the slither that sends chills down our spines? That is a mystery researchers have been trying to solve for some time.
There are currently o schools of thought. Some scientists believe that the reptiles dispensed with their legs to enable them to dwell in water. Others think that the reptiles evolved from burrowing lizards and shed their limbs over time
as they stretched and became longer.
对此，现在主要有两种假说。有些科学家认为蛇放弃进化自己的脚是为了更好的在水中生存。另一些科学家则认为蛇是由穴居蜥蜴进化而来的，它们慢慢伸展变长，逐渐放弃了自己的脚。
The first proof that the second theory is more likely came in July 2015. David Martill paleobiologist at the University of Portsmouth was leading a field trip at Germany's Museum Solnhofen when he stumbled upon a rare fossil of a four-legged snake that inhabited the pla 113-million years ago.
Now a new study conducted by a group of Scottish and American scientists further validates that snakes probably ditched their legs to slither through underground burrows
allowing them to avoid predators and pounce upon unsuspecting prey.
The team led by Hongyu Yi at Edinburgh’s School of GeoSciences reached the conclusion after studying a 90 million-year-old skull of the Dinilysia patagonica an ancient reptile that is closely related to the modern-day snake. The discovery was possible thanks to new CT scan technology that allowed them to create 3D models of the skull and pare them to that of modern snakes and lizards.
The researchers were looking to see if the reptiles shared the same unique ear structure that is found in burrowing animals. Sure enough
though the ear canals and cavities have adapted further in modern-day burrowing snakes and lizards
there remains a substantial similarity. Snakes that currently live in water or above ground do not have the same adaptations.
The evidence was enough for the scientists who published their findings in the online journal Science
to conclude that snakes had evolved on land. They believe that as the reptile's hearing sharpened and became accustomed to their subterranean habitat
its limbs began to recede
until they disappeared altogether.
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