D. The pollution of the environment is largely due to irresponsible humans.31. What will the following paragraph probably talk about? A. What humans should do with chemicals for future generations. B. How the environment affects the living things on the earth. C. What kind of chemicals are ...
For the history of life on Earth,organisms have relied on the light of the sun,moon,and stars to find their way and schedule their lives. While the beginning of electric lighting in the late 19th century may have benefited humans, it has caused problems in the natural world. Among the im...
Until now, Nature’s scoops had been mostly in physics — the discovery of electrons, radioactivity, isotopes, X-rays — but here was an author contending that humans had originated in Africa, “thus vindicating the Darwinian claim that Africa would prove to be the cradle of mankind”. Many...
For example, some scientists believe that dinosaurs died out because a large meteorite (陨石)fell on Earth from outer space. This changed the weather conditions of our planet. Certain plants became rare, and the huge animals died.In recent times, more animals have disappeared because of humans....
Humanity is a new experiment on planet Earth. For most of its history, life on Earth was restricted to the sea. Living things began to populate the land slightly over 400 million years ago. And humans have existed for no more than 3 million years. One way to represent the evolution of...
When it comes to life expectancy, the mere 80 or so years that humans have on Earth is just the blink of an eye compared to the Greenland shark or glass sponge. While super-long life spans are rare in the animal world, there are certain species that have won the evolutionary lottery ...
humans is those people who kill elephants for their teeth, tigers for their skin and so on.They sell some parts of animals for plenty of money.Toward the end of the nineteenth century, environmental researchers saw the need to protect the environment and animals, so national parks were built...
Few large animals live in national parks.Another problem that large animals face from humans is that people kill elephants for their teeth, tigers for their skin,and so on. They can sell the animal parts for plenty of money.Toward the end of 19th century, environmental researchers saw the ...
Humans first evolved in East Africa about 2.5 million years ago from an earlier genus of apes called Australopithecus, which means ‘Southern Ape’. The earth of a hundred millennia ago was walked by at least six different species of man. 1.2 The Cost of Thinking Despite their many differe...
The ensuing mass extinction erased about three-quarters of Earth's species, including the dinosaurs at the end of the Cretaceous Period, paving the way for mammals - eventually including humans - to become dominant. The researchers determined that it was springtime...