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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,2020/10/13,#,Revealing nature,Revealing nature,1,Have you,ever seen,these,mysterious animals,?,Have you ever seen these myste,2,Look at the page from a science,magazine and answer the questions.,1.What do you know about these animals?,What makes them special?,Komodo dragon:It evolved in Australia and spread westward,Duck-billed,platypus:The oldest discovered fossil of it dates back to about 100,000 years ago,Nautilus:It often considered“living fossils”,They,are all species that exit thousands of years on earth;They are old and rare(unusual).,2,.What other similar animals do you know about?,Share your knowledge with the class.,Starting out,Look at the page from a scienc,3,Komodo dragon:,(,科莫多巨晰）,Komodo dragons were first encountered by Western researchers in 1910.The researchers said the ancestor of the Komodo dragon most likely evolved in Australia and spread westward,reaching the Indonesian island of Flores 900000 years ago.,Komodo dragon:(科莫多巨晰）,4,The Komodo dragon,The Komodo dragon is the largest lizard in the world.It can grow to three metres in length and can weigh about 135 kilograms.Despite its size and weight,it can run for short distances at up to 20 kilometres per hour.,The Komodo dragon,5,Duck-billed platypus:,The first scientists to examine a preserved platypus body judged it a fake in the late 18,th,century.The oldest discovered fossil of the modern platypus dates back to about 100000 years ago.,Duck-billed platypus:,6,The Duck-billed platypus,The duck-billed platypus is a small egg-laying mammal(up to 60 cm in length)found only in Eastern Australia including Tasmania.As its name suggests,it has a mouth that looks like a ducks bill,while its thick fur and flat tail are similar to those of a beaver,（,海狸,）,.,The Duck-billed platypus,7,Nautilus,Fossil records indicate that the nautilus has survived relatively unchanged for around 500 million years.,That is why it is often given the name“living fossil.”,高中英语选修B1U5Revealing-nature-A-journey-of-discovery课件,8,1.How can seeds travel?How can this benefit plants?,Seeds usually are carried by the wind,water,and animals.,Plants can have a better chance,at,life.,Watch the video and answer the questions.,Watch the video and answer th,9,2.Can you think of another example of seeds travelling?Share it with the class.,Dandelion seeds have little parachutes to catch the wind and go further;,Humans can spread seeds if seeds get stuck to their clothing or shoes.,Dandelion seeds have little,10,Understanding ideas,A journey of,Discovery,Understanding ideasA journey o,11,Charles Darwin and his Theory of Evolution,Charles Darwin(1809-1882)was an English geologist and naturalist.In his famous book On the Origin of Species,Darwin proposed the theory that organisms(individual life forms)evolve extremely slowly.He stated that the organisms that were better suited to their environments would survive and pass on their favourable characteristics to the next generation,while the less suitable organisms would gradually die out.He called this process“natural selection.”,Charles Darwin,Charles Darwin and his Theory,12,1.What species do you recognize in the picture?,Look at the evolutionary tree and answer the questions.,Paramecium,earthworm,snail,crab,fish,tortoise,bird,horse,human,frog,alga,moss,fern,plant,1.What species do you recogniz,13,2 What factors can cause the process of evolution?,The ever-changing environment of nature;environmental changes;population immigration;genetic mutation;,cultural,preferences.,2 What factors can cause the p,14,Read the passage and talk about your understanding of the title.,Most,commonly,people believe that a journey means a trip from one place to another,especially over a long distance and literarily a journey refers to the process by which something gradually changes and develops.The title may indicate that Darwins research work leading to his discovery of evolution and the origin of species,.,Read the passage and talk abou,15,A young man who had left medical school without completing his degree.,Whats more,his father predicted in his letter that he would be“a disgrace to yourself and all your family.”,Despite,all this,his adventures on this ship would lead to one of the most important scientific discoveries of all time.,Beagle,The beginning of the journey,A young man who had left me,16,Charles Darwin was a geologist and naturalist,fascinated by rocks,plants and animals.,Darwin studied:,various living things in their natural environments and samples of the plants and animals he had collected.,He noticed:,that some species of animals were very similar to each other.,On his journey on the Beagle,Charles Darwin was a geologist,17,At that time,people believed that all species had appeared on Earth at the same time,and had not changed since.,However,as he studied these,Darwin asked himself the questions:,Generate ideas,How did different species come to exist?,Maybe animals evolved as they adapted to their cha
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