How many species of African violets are there? For many years the experts and the AVSA Handbook have said twenty to thirty. However, more recent research indicates that there are more likely only six with an additional ten subspecies. How can this be?Let's first take a look at the ...
Nowadays, there are many celebrities who are famous for their glamour and wealth rather than achievements and this sets a bad example for young people. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience....
化学与人体健康密切相关：（1）市场有“铁强化酱油”、“含氟牙膏”、“高钙牛奶”、“加碘食盐”等商品，这里的铁、氟、钙、碘应理解为___（填编号）①元素②原子③分子④氧化物（2）妈妈每天为小明准备的食品有：奶类、豆类、鱼肉类、水果、蔬菜、面食等，这些食品中含有___等人体所需营养素（只需填写两种...
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...
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...
A. They are B. What is C. There is D. It is试题答案 在线课程 分析 不清楚有多少动物物种正面临灭绝的危险. 解答 答案:D.根据真正主语how many animal species are in the danger of dying out可见空白处应为形式主语,纵观选项,唯有it可担当形式主语,故选D.注意区分主语从句B选项what…is 从句,就对...
In the last decade, new methods of estimating global species richness have been developed and existing ones improved through the use of more appropriate statistical tools and new data. Taking the mean of most of these new estimates indicates that globally there are approximately 1.5 million, 5.5 ...
Nekton are any aquatic species that swim independent of water currents. This allows them to travel through the water column, rather than remaining on the sediment at the bottom of a body of water.Answer and Explanation: There are likely hundreds of thousands of nekton species or more, with ...
Salah Sukkarieh, a professor at the University of Sydney, sees robots as necessary given how cattlemen are aging. He is building a four-wheeled robot that will run on solar and electric power. It will use cameras and sensors to monitor the animals. A computer system will analyze the video...
Moreover, if the turtle is young, it will require daily protein intake to grow and develop healthily. Therefore, in this case, there is no room for the question “How many days can a baby turtle live without food?” While leaving the turtle for a weekend, it is to be made sure that...