Answer:
Explanation:
More than 99 percent of all organisms that have ever lived on Earth are extinct. As new species evolve to fit ever changing ecological niches, older species fade away. But the rate of extinction is far from constant. At least a handful of times in the last 500 million years, 75 to more than 90 percent of all species on Earth have disappeared in a geological blink of an eye in catastrophes we call mass extinctions.
Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals and birds to rapidly diversify and evolve.
Answer:
The Treaty of Vienna of 25 March 1815 was the formal agreement of the allied powers — Austria, Great Britain, Prussia and Russia — committing them to wage war against Napoleon until he was defeated.
Explanation:
A person's manner of walking
From the moment of birth, children are curious about the world. They see, hear, touch, smell, and even taste. This period of discovery is becoming increasingly hampered by computers. To adults, computers are irreplaceable. They enable them to connect, learn, and work. To small children they are simply a tool used to spend time having fun. This precious time is something better spent exploring the world we live in. Rather than growing and learning, they plop down in front of a laptop and watch Tom & Jerry all day long. Sure, our childhoods wouldn't be the same with out a few cartoons, but watching Netflix for several hours a day is not the path future generations should walk. Yet, how do parents limit computer time when they themselves carry a computer around in their pocket 24/7?
