Why Havent All Primates Evolved into Humans

first_img “Some difference in habitat selection probably would’ve been the the first notable behavioral change,” Isbell said. “To get bipedalism going, our ancestors would have gone into habitats that didn’t have closed canopies. They would have had to travel more on the ground in places where trees were more spread out.” The rest is human evolutionary history. As for the chimps, just because they stayed in the trees doesn’t mean they stopped evolving. A genetic analysis published in 2010 suggests that their ancestors split from ancestral bonobos 930,000 years ago, and that the ancestors of three living subspecies diverged 460,000 years ago. Central and eastern chimps became distinct only 93,000 years ago. “They’re clearly doing a good job at being chimps,” Pobiner said. “They’re still around, and as long as we don’t destroy their habitat, they probably will be” for many years to come. Why Do Some Animals Eat Their Own Poop? Originally published on Live Science.by Taboolaby TaboolaSponsored LinksSponsored LinksPromoted LinksPromoted LinksYou May LikeGundry MD SupplementsTop Cardiologist: This One Thing Will Properly Flush Out Your BowelsGundry MD SupplementsUndoMarie Claire | HanacureMeet The Beauty Equivalent To TIME’s Person Of The Year AwardMarie Claire | HanacureUndoVikings: Free Online GameIf You’re Over 40 And Own A Computer, This Game Is A Must-Have!Vikings: Free Online GameUndoUltimate Pet Nutrition SupplementsAging Cat? 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But why did one of her evolutionary offspring go on to accomplish so much more than the other? [Chimps vs. Humans: How Are We Different?]  AdvertisementWhy Do Leaves Change Colors in the Fall?For years, scientists have studied how leaves prepare for the annual show of fall color. The molecules behind bright yellows and oranges are well understood, but brilliant reds remain a bit of a mystery.Your Recommended PlaylistVolume 0%Press shift question mark to access a list of keyboard shortcutsKeyboard Shortcutsplay/pauseincrease volumedecrease volumeseek forwardsseek backwardstoggle captionstoggle fullscreenmute/unmuteseek to %SPACE↑↓→←cfm0-9接下来播放Does Turkey Make You Sleepy?01:23关闭选项Automated Captions – en-US facebook twitter 发邮件 reddit 链接https://www.livescience.com/32503-why-havent-all-primates-evolved-into-humans.html?jwsource=cl已复制直播00:0001:3901:39  Could Evolution Ever Bring Back the Dinosaurs?center_img Why Humans Outlive Apes “The reason other primates aren’t evolving into humans is that they’re doing just fine,” Briana Pobiner, a paleoanthropologist at the Smithsonian Institute in Washington, D.C., told Live Science. All primates alive today, including mountain gorillas in Uganda, howler monkeys in the Americas, and lemurs in Madagascar, have proven that they can thrive in their natural habitats. “Evolution isn’t a progression,” said Lynne Isbell, a professor of anthropology at the University of California, Davis. “It’s about how well organisms fit into their current environments.” In the eyes of scientists who study evolution, humans aren’t “more evolved” than other primates, and we certainly haven’t won the so-called evolutionary game. While extreme adaptability lets humans manipulate very different environments to meet our needs, that ability isn’t enough to put humans at the top of the evolutionary ladder. Take, for instance, ants. “Ants are as or more successful than we are,” Isbell told Live Science. “There are so many more ants in the world than humans, and they’re well-adapted to where they’re living.” While ants haven’t developed writing (though they did invent agriculture long before we existed), they’re enormously successful insects. They just aren’t obviously excellent at all of the things humans tend to care about, which happens to be the things humans excel at. “We have this idea of the fittest being the strongest or the fastest, but all you really have to do to win the evolutionary game is survive and reproduce,” Pobiner said. Our ancestors’ divergence from ancestral chimps is a good example. While we don’t have a complete fossil record for humans or chimps, scientists have combined fossil evidence with genetic and behavioral clues gleaned from living primates to learn about the now-extinct species whose descendants would become humans and chimps. “We don’t have its remains, and I’m not sure if we’d be able to place it with certainty in the human lineage it if we did,” Isbell said. Scientists think this creature looked more like a chimpanzee than a human, and it probably spent most of its time in the canopy of forests dense enough that it could travel from tree to tree without touching the ground, Isbell said. Scientists think ancestral humans began distinguishing themselves from ancestral chimps when they started spending more time on the ground. Perhaps our ancestors were looking for food as they explored new habitats, Isbell said. “Our earliest ancestors that diverged from our common ancestor with chimpanzees would have been adept at both climbing in trees and walking on the ground,” Isbell said. It was more recently — maybe 3 million years ago — that these ancestors’ legs began to grow longer and their big toes turned forward, allowing them to become mostly full-time walkers. Lucy belongs to one of the best known early human species, Australopithecus afarensis, which lived about 3.85 million to 2.95 million years ago. Credit: Copyright Field Museum; photographer John Weinstein last_img

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