on species survival. Traditionally, scientists have viewed the extinction of plants and animals as predominantly a biological problem – with dwindling populations in shrinking fragments of natural habitat....
Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, “How many species are on Earth?”“It’s a very simple question, but we have no simple answer,” Fisher said. One of the reasons we can’t get an...
How did the Earth get so many species (物种)? For thousands of years, people wondered. In the 1840s,one naturalist had an idea. His name was Charles Darwin. He spent his whole life studying animals and insects (昆虫). Darwin thought that new species developed slowly, as populations of ...
Many extinct animals that people think of as dinosaurs aren't actually dinosaurs because they don't share one or more of the dinosaurs' basic traits: Dinosaurs were animals with four limbs, although not all walked on all four legs. Although they may have ventured into the water, they were ...
Why the species is able to delay gratification is a bit of a mystery.For humans,scientists believe the quality strengthens social bonds.An example would be when you see someone wait for a partner to eat.Delayed gratification can also be a function of tool-building animals,who need to make ...
When applied to all five known eukaryote* kingdoms of life on Earth, the approach predicted: ~7.77 million species of animals (of which 953,434 have been described and cataloged) ~298,000 species of plants (of which 215,644 have been described and cataloged) ...
Earth's biological diversity is being fast decline of many species facing extinction. Threat to the survival of wild animals and plants is a major factor in habitat loss, business development, and wild animals and plants and their products in international trade. Resources are limited, it is ...
doi:10.1603/0013-8746(2007)100[95:HMSOGI]2.0.CO;2M. Espírito-SantoG. FernandesEspirito-Santo, M.M. & Fernandes, G.W. 2007. How many species of gall-inducing insects are there on earth, and where are they? Annals of the Entomological Society of America, 100: 95-99....
aWhich human factor most seriously threatens the survival of animals? 正在翻译,请等待...[translate] aHabitat destruction. 正在翻译,请等待...[translate] aHow many species of birds, mammals, invertebrates, and plants are endangered? 正在翻译,请等待...[translate]...
Some people say it is acceptable to use animals for our benefit, others say it is wrong to exploit them. Discuss both points of view and give your opinion. Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words. Task...