Answer: 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
A. The height of your back legs will probably not change throughout the experiment, but your jump height may so you will add each of the jump heights together and divide by the amount of times jumped. Hope this helped
Decomposition of organic matter (i.e. dead plant and animal remains) in soils is an important process in any ecosystem. As organic matter is decomposed, water, carbon dioxide and nutrients are released
