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How many species are there on Earth according to most scientists？A．About 2 million.B．About

How many species are there on Earth according to most scientists？

A．About 2 million.

B．About 10 million.

C．About 100 million.

D．About 1.75 million.

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更多“How many species are there on …”相关的问题

第1题

Many species of animals which once lived on the earth_____no longer in existence.

A.is

B.are

C.was

D.were

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第2题

A．Why species don't avoid extinction by adapting.B．Why species become extinct at the r

A．Why species don't avoid extinction by adapting.

B．Why species become extinct at the rate they do.

C．Why humans aren't extinct.

D．How many species aren't extinct.

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第3题

Why is it a problem if all the smaller fish species die？ A. It's not healthy for the

Why is it a problem if all the smaller fish species die？

A. It's not healthy for the environment.

B. People only like to catch big fish.

C. There are too many small fish.

D. The smaller fish can get lost in the lake.

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第4题

In Ethiopia there are nine national parks,two of which include the mountain groups of the Simien and

the Bale,while the others lie in the Rift Valley towards Kenya.The unforeseeable wild landscapes are surely the main attraction of these parks,where many of the animal species are protected,and some of them are endemic to the area.The proximity of Ethiopia to the Equator and the variety of its habitats make it one of the richest countries in Africa in wild bird life.

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第5题

South America Located mostly（most) in the southern half of the earth, South America is a v

South America Located mostly(most) in the southern half of the earth, South America is a very（41）_____(interest) continent. The northern part of the continent is（42）_____(cover). By the Amazon Rainforest, which is home to thousands of the plant animal species. It is a very important force（43）_____(shape) the world's weather and climate patterns. And it is also important for the（44）_____(develop) of the economy of South America. Products such as chocolate, rubber, coffee and many kinds of medicine are（45）_____(harvest) from the plants found in the rainforest. Even the liquid from the skin of some species of tree frogs are being used as（46）_____(experiment) medicines. Other parts of South America are very（47）_____(differ).The Andes Mountains spread over the（48）_____(west) part of South America. The ranges, about 5500 miles long, are a continuous barrier, with many peaks rising beyond 2000（49）_____(foot). Southern South America is an extremely（50）_____(wind) and cold place where many species of penguins（企鹅）, seals and whales live. _____

_____

请帮忙给出每个问题的正确答案和分析，谢谢！

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第6题

How many () can I take.

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第7题

根据以下资料，回答{TSE}题。 Up until a few decades ago, our visions of the future were larg

ely - though by no means uniformly - glowingly positive.Science and technology would cure all the ills of humanity, leading to lives of fulfillment and opportunity for all. Now utopia has grown unfashionable, as we have gained a deeper appreciation of the range of threats facing us, from asteroid strike to epidemic flu and to climate change.You might even be tempted to assume that humanity has little future to look forward to. But such gloominess is misplaced.The fossil record shows that many species have endured for millions of years - so why shouldn't we？ Take a broader look at our species' place in the universe, and it becomes clear that we have an excellent chance of surviving for tens, if not hundreds, of thousands of years .Look up Homo sapiens in the "Red List" of threatened species of the International Union for the Conversation of Nature (IUCN) ,and you will read: "Listed as Least Concern as the species is very widely distributed, adaptable, currently increasing, and there are no major threats resulting in an overall population decline." So what does our deep future hold？ A growing number of researchers and organisations are now thinking seriously about that question.For example, the Long Now Foundation has its flagship project a medical clock that is designed to still be marking time thousands of years hence . Perhaps willfully , it may be easier to think about such lengthy timescales than about themore immediate future.The potential evolution of today's technology, and its social consequences, is dazzlingly complicated, and it's perhaps best left to science fiction writers and futurologists to explore the many possibilities we can envisage.That's one reason why we have launched Arc, a new publication dedicated to the near future. But take a longer view and there is a surprising amount that we can say with considerable assurance.As so often, the past holds the key to the future: we have now identified enough of the long-term patterns shaping the history of the planet, and our species, to make evidence-based forecasts about the situations in which our descendants will find themselves. This long perspective makes the pessimistic view of our prospects seem more likely to be a passing fad.To be sure, the future is not all rosy.But we are now knowledgeable enough to reduce many of the risks that threatened the existence of earlier humans, and to improve the lot of those to come. {TS}Our vision of the future used to be inspired by

A. our desire for lives of fulfillment

B. our faith in science and technology

C. our awareness of potential risks

D. our belief in equal opportunity

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第8题

-__-It’s 70 yuan（）

A.How many are there

B.How much is it

C.How much are they

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第9题