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 ...
The Leguminosae is the third most speciose family in the country, with about 1,200 species of which c. 100 are endemic. As part of our ongoing revision of the genus Macropsychanthus , we here describe M. elegans , which is characterised by its canescent, sericeous leaflets, keel petals ...
In many parts of the world, children are given more freedom than in the past. Is this a positive or negative development? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words. Task 2 利弊比较题 社会生活类 - - 范文...
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...
正确答案:C 解析:本题的关键是数字信息的听辨和记录。根据原文“Around 380 million years ago,only 300 species groups were left in existence”,可以判断C是正确选项。 知识模块:句子听辨 听力原文:During the past 1. 65 million years, there have been four major episodes of global cooling, which resulte...
All three species can be found in a small area of a few square-kilometers; although no syntopic occurrence was recorded.doi:10.5431/aramit4105Günther RaspotnigJürgen GruberChristian KomposchReinhart SchusterIvo KaramanArachnologische Gesellschaft (ARAGES)Arachnologische Mitteilungen...
How many new species of monkeys have been identified in Brazil alone over the last year? A. Eight. B. Nine. C. Ten. D. Eleven. 相关知识点: 试题来源: 解析 B 正确答案:B解析:事实细节题。本题询问去年只在巴西一国就新发现多少种猴子。本题答案可以从文章第二段末句得出。选项B为正确答案...
Vitamin C, also referred to as ascorbic acid or ascorbate, has been one of the most researched vitamins over the last 50 years. A search of the scientific literature reveals that over 65,000 studies have been conducted on vitamin C in the past century. Many scientists believe that at one...
大学英语作文:How to Protect The Endangered Species in The World 1 today there are many endangered species in the world. it’s time to do something for the animals which are almost etinct. what we should do? first, finding what the source of the situation is. people have destroyed the en...
Biodiversity(生物多样性), or biological diversity, is a wide-ranging concept that covers all the different kinds of plant and animal species present on earth. Environmentalists believe that many millions of species exist. As all these living organisms are dependent on each ot...