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:
As early as the 1930´s Great Depression, redlining racist practices had federal housing lending programs limiting loans for African American neighborhoods.
Explanation:
Minority groups had higher interest rates than those offered to white people, and sometimes possible foreclosures forced them to take more loans with even higher interest rates, reinforcing the cycle of debt and poverty.
This discrimination in access to buy land lasted until the 1970s and is still present in the prevailing real estate market.
