's List of Every Word of the Year - Everything After Z's List of Every Word of the Year - Everything After Z

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It can only cope with the present. But the border between life and non-life is surprisingly fuzzy. They're heavy, they get soaked in the rain, and they don't exactly improve the birds' lift.

Odontogriphus omalus left has a primitive radula — a toothy ribbon used by mollusks to feed — and a gill structure and a broad mollusk foot. Learn more about how our partners use this data, and select 'Manage options' to set your data sharing choices with our partners. Figuring out why, and why then, is more challenging.

Analysis of human versus fruit fly DNA indicates that we use basically the same genes, just in different ways with different combinations and different timing. Thousands of trilobite species evolved during the Paleozoic Era, the last of them dying out around million years ago.


Their shoulder joints loosened, allowing for greater movement. Even when an organism is well-suited to a particular environment, and can out-compete others for limited resources, that's no guarantee of everlasting success.

We must not let this continue to be the norm. Local predators turned out to be unfussy eaters. But these situations are rare. Trilobites could roll up like a modern-day pill bug or armadillo.

From "Going Global by Adapting Local: In the shorter term, scientists put developmental pressure on stickleback fish in an experiment published in Gene studies have turned up groups of genes, sometimes called modules or termed "deep homology," that have continued working with each other for literally millions of years.

For organisms to fossilize, the immediate surroundings need to be slightly acidic. The vast majority of trilobites never left behind fossils, but they fossilize better than many other animals.

And because sticklebacks often stick to their own size when it comes to mating, that promotes isolation of different reproductive Dating tech startups. Our choice for Word of the Year is as much about what is visible as it is about what is not.

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This species got more familiar and less weird when paleontologists turned it right side up and situated its head on the right end of its body. When the plague, often referred to as the Black Death, struck Europe, it devastated the population, but a lucky few survived.

The reaction was fierce. Evolution of other organisms plays a role in human healthcare. Off Florida's Gulf Coast lies a geologically young island archipelago, inhabited by pale-hued mice, Peromyscus polionotus.

Because evolution doesn't have to be perfect, it merely has to be effective.