Bro semua kehidupan termasuk manusia berevolusi setiap masa. Kita sahaja yang tidak nampak dengan mata kasar kerana proses itu terlalu perlahan dan juga ada yang tampa kita sedari kerana kita tidak mengikuti perkembangan semasa mengenai evolusi.
Sebagai contoh, beberapa tahun lepas saintis mendapati otak black European semakin membesar untuk penyesuaian dengan kehidupan mereka di eropah..sebab itu mereka semakin cerdik.
Dan ini juga...
When we think of human evolution, our minds wander back to the thousands of years it took natural selection to produce the modern-day man. But are we still changing as a species, even today? New research suggests that, despite modern technology and industrialization, humans continue to evolve. "It is a common misunderstanding that evolution took place a long time ago, and that to understand ourselves we must look back to the hunter-gatherer days of humans," says Dr. Virpi Lummaa from the University of Sheffield's department of animal and plant sciences. But not only are we still evolving, we're doing so even faster than before. In the last 10,000 years, the pace of our evolution has sped up 100 times, creating more mutations in our genes, and more natural selections from those mutations. Here are some clues that show humans are continuing to evolve. 1. We Drink Milk
Historically, the gene that regulated a human's ability to digest lactose shut down as they were weaned off of their mother's breast milk. But when we began domesticating cows, sheep and goats, being able to drink milk became a nutritionally advantageous quality, and people with the genetic mutation that allowed them to digest lactose were better able to propagate their genes. A 2006 study suggests this tolerance for lactose was still developing as early as 3,000 years ago in East Africa. That genetic mutation for digesting milk is now carried by more than 95 percent of Northern European descendants. 2. We're Losing Our Wisdom Teeth
Our ancestors had much bigger jaws than we do, which helped them chew a tough diet of roots, nuts and leaves. And what meat they ate they tore apart with their teeth, all of which led to worn down chompers that needed replacing. Enter the wisdom teeth: A third set of molars is believed to be the evolutionary answer to accomodate our ancestors' eating habits. Today, we have utensils to cut our food. Our meals are softer and easier to chew, and our jaws are much smaller as a result, which is why wisdom teeth are often impacted when they come in — there just isn't room for them. Like the appendix, wisdom teeth have become vestigial organs. One estimate says 35 percent of the population is born without wisdom teeth, and some say they will disappear altogether.
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Post time 25-7-2017 04:47 AM
