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for questions 41-45 ,choose the most suitable one from the list a-g to fit into each of the numbered blank. there are two extra choices ,which do not fit in any of the gaps .mark your answers on answer sheet 1.(10 points) long before man lived on the earth , there were fishes ,reptiles, birds, insects, and some mammals. although some of these animals were ancestors of kinds living today ,others are now extinct, that is, they have no descendants alive now . 41) . very occasionally the rocks show impression of skin, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago. that kind of rock in which the remains are found tells us much about the nature of the original land ,often of the plants that grew on it, and even of its climate. 42) . nearly all of the fossils that we know were preserved in rocks formed by water action, and most of these are of animals that lived in or near water. thus it follows that there must be many kinds of mammals, birds, and insects of which we know noting. 43) . there were also crablike creatures, whose bodies were covered with a horny substance. the body segments each had two pairs of legs, one pair for walking on the sandy bottom ,the other for swimming. the head was a kind of shield with a pair of compound eyes, often with thousands of lenses. they were usually an inch or two long but some were 2 feet. 7€$3*oyF5#n-'IE`9[±¾_ÎÄ_À´_Ô´_ÓÚ_ÎÒ_µÄ_ѧ_ϰ_Íø¿¼ÑÐÒ»·½¿¼ÑÐÓ¢Óï http://Www.GZU521.Com ]7€$3*oyF5#n-'IE`9 44) . of these, the ammonites are very interesting and important .they have a shell composed of many chambers , each representing a temporary home of the animal .as the young grew larger it grew a new chamber and sealed off the previous one .thousands of these can be seen in the rocks on the dorset coast . 45) . about 75 million years ago the age of reptiles was over and most of the groups died out .the mammals quickly developed, and we can trace the evolution of many familiar animals such as the elephant and horse . many of the later mammals though now extinct ,were known to primitive man and were featured by him in cave paintings and on bone carvings . [a]the shellfish have a long history in the rock and many different kinds are known. [b]nevertheless , we know a great deal about many of them BECause their bones and shells have been preserved in the rocks as fossils ,from them we can tell their size and shape ,how they walked ,the kind of food they ate . [c]the first animals with true backbones were the fishes ,first known in the rocks of 375 million years ago .about 300 million years ago the amphibians ,the animals able to live both on land and in water , appeared. they were giant ,sometimes 8 feet long ,and many of them lived in the swampy pools in which our coal seam ,or layer ,or formed .the amphibians gave rise to the reptiles and for nearly 150 million years these were the principal forms of life on land ,in the sea ,and in the air . [d]the best index fossils tend to be marine creature .there animals evolved rapidly and spread over large over large areas of the world . [e]the earliest animals whose remains have been found were all very simple kinds and lived in the sea. later forma are more complex ,and among these are the sea-lilies , relations of the star-fishes ,which had long arms and were attached by a long stalk to the sea bed ,or to rocks . [f]when an animal dies ,the body ,its bones ,or shell ,may often be carried away by streams into lakes or the sea and there get covered up by mud .if the animal lived in the sea its body would probably sink and be covered with mud .more and more mud would fall upon it until the bones or shell become embedded and preserved . [g]many factors can influence how fossils are preserved in rocks .remains of an organism may be replaced by minerals, dissolved by an acidic solution to leave only their impression, or simply reduced to a more stable form . £Û2006Ä꿼ÑÐÓ¢ÓÊÔ´ó¸ÙÌâ½â£Ý ±¾Æª½éÉܵÄÊÇʷǰÀදÎï¡£ÎÄÕ½ṹµÄÂöÂçÇåÎú£ºÊ×ÏȽéÉÜʲôÊÇʷǰ¶¯ÎïºÍÎÒÃÇÑо¿Ê·Ç°¶¯ÎïµÄÒÀ¾Ý¡ª¡ª»¯Ê¯£¬ÒÔ¼°»¯Ê¯ÐγɵĹý³Ì¡£Ëæºó£¬×÷Õß¼´°´ÕÕ¶¯Îï½ø»¯µÄ˳Ðò¡ª¡ªÎÒÃÇ¿ÉÒÔ¼ûµ½Æä»¯Ê¯µÄ×îÔçµÄ¶¯ÎˮÉú¿ÇÀදÎ¼¹×µÀදÎ¡ªÖðÒ»¼ÓÒÔ½éÉÜ¡£ 41£®ÎÄÕÂÒ»¿ªÊ¼£¬×÷Õ߸æËßÎÒÃÇ£¬ÔçÔÚÈËÀà³öÏÖÒÔǰµØÇòÉϾÍÐí¶àÎïÖÖ£¬ÏÖÔÚÓÐЩÎïÖֵĺó´úÒÀÈ»Éú´æ£¬¶øÁíÍâһЩÔòûÓÐÁôϺóÒá¡£ÔÚ±¾Ìâ¿Õ°×´¦ºóÃæÎÄÕÂÓÖ˵ÑÒʯÉÏż¶û»áÁôÏÂÊý°ÙÍòÄêǰ¾ÍËÀµôÁ˵͝ÎᆱȷµÄÓ¡¼Ç¡£ÏÔÈ»£¬¿Õ°×´¦Ó¦¸ÃÊǹØÓÚÑÒʯÓëÃð¾øÁ˵͝ÎïÖ®¼äµÄ¹ØÏµ£¨7¸öÑ¡ÏîÖÐÓÐa©pb©pe©pgËÄÏîÌáµ½ÁË¡°rock¡±£¬µ«ÁíÍâ´óÈýÏîÒâ˼Éϲ»·û£©¡£´ËÍ⣬¿Õ°×´¦Ç°ÃæµÄ¡°extinct¡±ºÍ¡°no descendant¡±¾ùΪ·ñ¶¨ÒâÒåºÍ±í´ï£¬¶ø¿Õ°×´¦µÄºóÃæ¡°accurate¡±ºÍ¡°much¡±ÔòΪ¿Ï¶¨ÒâÒåµÄ±í´ï£»ÕâÒâζ×ſհ״¦µÄÄÚÈÝÓ¦¸ÃÓÐÒ»¸ö½á¹¹Éϵġ°×ªÕÛ¡ªÖ»ÓÐbÏî·ûºÏÕâÒ»Ìõ¼þ¡£ËùÒÔÕýÈ·´ð°¸Ö»ÄÜÊÇb¡£(×¢Ò⣺ÕâµÀÌâÈ¥ÄêµÄ¿¼ÊÔ´ó¸ÙÖÐÊǶÎβÌ⣬ÏÖÔÚ³ÉÁ˶ÎÖÐÌ⣬¹À¼ÆÊÇ´òÓ¡´íÎó¡£) 42£®±¾Ì⿼²éѰÕÒÌØÕ÷´ÊµÄÄÜÁ¦¡£ÔÚ¸ÃÌâÖУ¬¸ù¾Ý¾Í½üÔÔòÔÚ¸ÃÌâºóµÄ¾ä×ÓÖÐÕÒµ½¡°the fossils¡±ºÍ¡°water action¡±ÎªÌØÕ÷´Ê¡£¡°the fossils¡±ËµÃ÷¡° fossils¡±Ò»´ÊÊÇÖÁÉÙÊǵڶþ´Î³öÏÖ£¬ÒòΪËüÇ°Ãæ¼ÓÁ˶¨¹Ú´Êthe£¬Í¨¹ý×Ðϸ¹Û²ì²¢²»ÄÑ·¢ÏÖ£¬42ÒÔ¼°ÆäÇ°ÃæµÄÄÚÈÝÖж¼Ã»ÓÐfossils£¬Õâ¾ÍÈ·¶¨fossilsÒ»´Ê±Ø¶¨³öÏÖÔÚ41£¬42ÖС£¸ù¾ÝÒâȺÏàÒ»ÖÂÔÔò£¬ÔÚ42Öбض¨ÒªÓë¡°water action¡±Í¬ÏÖ»ò¸´ÏÖµÄÓïÑԵ㡣×ÛÉÏËùÊö£¬Ö»ÓÐͬʱÂú×ãÒÔÉÏÁ½¸öÌõ¼þµÄÑ¡Ïî²ÅÊÇÕýÈ·´ð°¸¡£ËäÈ»gÏîÒ»¿ªÊ¼¾ÍÓС°how fossils are preserved¡±£¬ÓëÉÏÎĺÍÏÂÎÄËÆºõ¶¼ÊÇÏàÎǺϵ컵«ÊÇgÏîºóÃæ½²µÄÊǶ¯ÎïÒÅÌåÉϵÄÓлú×éÖ¯¡°organism¡±¿ÉÄÜת´ï»¯³É¼¸ÖÖÐÎʽ£¬¶ø±¾Ìâ¿Õ°×´¦ºóÃæµÄÄÚÈÝÔò¸æËßÈËÃÇ¡°nearly all of the fossils that we know were preserved in rocks formed by water action¡±(ÑÒʯÖм¸ºõËùÓеĻ¯Ê¯¶¼ÊÇÓÉÓÚË®×÷ÓÃÄàɳ¶ÔÓÚ»¯Ê¯±£´æÏÂÀ´ËùÆðµÄ×÷ÓáªÓëÉÏÏÂÎÄÏà·ûºÏ¡£ 43£®±¾ÌâÑ¡ÔñµÄÌØÕ÷´ÊÊÇ¡°also¡±¡£¡°also¡±±í²¢ÁйØÏµ£¬Õâ¾ÍÖ¤Ã÷ÔÚ43Ç°ÃæµÄ¾ä×ÓÖÐÓ¦µ±ÓëalsoºóµÄcrab-like creaturesÏಢÁУ¬¼´¿Õ°×´¦ÏÔÈ»ÓйØÓÚÁíÒ»¶¯ÎïµÄÄÚÈÝ£»´Ó±¾¶Î¿ªÊ¼£¬ÎÄÕÂתÏòÌÖÂÛÓɵͼ¶¸ß¼¶±ä»¯£¨½ø»¯£©Öе͝Îï¡£eÏʼµÄ²¿·ÖÊÇ¡°the earliest animals whose remains have been found¡¡±£¬·ûºÏÎÄÕÂд×÷µÄ˳Ðò¡£bÏîÓëÉÏÎÄÏà·û£¬µ«ÓëÏÂÎIJ»·û£¬ÇÒÓëÈ«ÎĽṹ²»ÏàÎǺϡ£ 44£®±¾ÌâÑ¡ÔñµÄÌØÕ÷´ÊÊÇtheseÒÔ¼°ÓëÆä¾ßÓÐָͬ¹ØÏµµÄammonites ºÍthey ¡£Í¨¹ýÔĶÁ44ÒÔºóµÄÁ½¸ö¾ä×Ó²»ÄÑ·¢ÏÖ£¬these£¬ammonites £¬theyÊÇָͬһÊÂÎÒâ¼´ÓС°shell¡±µÄÊÂÎͬʱ44ºóÒ»¿ªÊ¼¾ÍÓС°of these,¡¡±,Ò²¾ÍÊÇ˵£¬¿Õ°×²¿·ÖÓ¦¸ÃÓС°some, several, many¡±»òÀàËÆµÄ´Ê£¬´ð°¸Ö»ÄÜÊÇa¡£ÓÉÓÚÎÄÖÐÓÐÁË¡°the first animals¡±£¬Îª±ÜÃâ¾äʽÉϵÄÖØ¸´£¬×÷Õ߸ıä¾ä×ÓÆðʼµÄģʽ¡ªÕâÖÖ×ö·¨ºÜ¶à¼û£¬Òò¶øÒ²ÊÇ¿¼ÉúÔĶÁºÍд×÷ÖÐÓ¦¸Ã×¢ÒâµÄ¡£ 45£®¸ÃÌâÄ¿ÊÇÒ»µÀ¼òµ¥ÊÔÌ⣬һ·½ÃæÕâÊÇÒ»µÀ¶ÎÂäÌ⣬Õâ¾Í¾ö¶¨ÁËÓпÉÄÜÑ¡×µÄÑ¡ÏîΪ´ð°¸£¬ÁíÒ»·½Ãæ¸ù¾Ý¾Í½üÔÔòÔÚÏÂÒ»¶ÎÊ×¾äÖз¢ÏÖµÄabout 75 million years ago³ÉΪÎÒÃǽâÌâµÄ¹Ø¼ü¡£´ÓÎÄÕµÄÕûÌå½á¹¹¿´£¬ÕâÀïÐèÒªÒ»¸öÄÚÈݵġ°¸ß³±¡±£ºÇ°Ã漸¶Î£¬¶¯Îï¶¼ÔÚ²»¶ÏµÄ½ø»¯£¬¶øÏÂÎÄÖС°about 75 million years ago the age of reptiles was over¡±£¬ÕâÀïÐèÒªÓÐÒ»¸ö¡°½»´ú¡±¡£Ö»ÓÐcÏî·ûºÏÕâÒ»Ìõ¼þ£»Í¬Ê±£¬¡°reptile¡±ÔÚ±¾Ìâ¿Õ°×´¦Ç°ÎÄÕÂÖдÓûÓÐÌáµ½£¬ÔÚÏÂÎÄÖÐÓÖûÓÐ×÷ΪÐÂÐÅÏ¢£¬Òò¶ø×÷ΪÕýÈ·´ð°¸µÄÑ¡ÏîÖÐÒ»¶¨ÓÐÕâ¸ö´Ê£¬Ö»ÓÐcÏîÖÐÓС°the amphibians gave rise to the reptiles for nearly 150 million years these were the principal forms of life on land, in the sea, and in the sea ,and in the air¡±¡£ËùÒÔÕýÈ·´ð°¸Ö»ÄÜÊÇc¡£ ¾ä×ÓÌî¿ÕÐÂÌâÐÍÈ«ÕæÄ£ÄâÁ·Ï°ÆªÖ®Ò» could anything be more majestic, serene or threatening than the largest bird of prey in the world, the harpy eagle, soaring above its domain? weighing nine kilograms and with a 2.2 meter wingspan, this giant of the sky glides at 65 kilometers per hour over dense brazilian rainforest. its cruel head with flaring colored crest and huge hooked beak twists constantly from side to side. it spots a monkey in treetop 2.5 kilometres away and closes in on its prey. the monkey munches on, oblivious to the threat. then the eagle strikes, plucking its prey from its perch with talons borne on legs the thickness of your wrists. 41£© . the eagle caries the body back to its treetop lair. the famed and feared harpy eagle has killed again. whether this frightening creature does indeed soar like other eagles in search of prey is open to conjecture. for less in know about the harpy than any other eagle¡ªthe remoteness of its habitat sees to that. 42£© . this eagle¡¯ s extraordinary eyesight is one of its greatest assets. like many other eagles, it can see between four and eight times as much detail as can humans. 43£© . the latter is an obvious requirement if prey is to be snatched at speed. it¡¯s hard to believe that a creature so well equipped to survive could ever find itself under threat. but with huge tracts of rainforest being felled in central and south amirica, the harpy¡¯s food sources are harder to find. the threat posed could soon be similar to that facing the harpy¡¯s near relative, the philippines monkey-eating eagle. 44£© . like this filipino cousin, the harpy eagle nests in the tops of the largest forest trees. it therefore needs an intact forest to breed. the seemingly invincible harpy is vulnerable for another reason. a mating pair is thought to produce only one eagle every two years. harpy eggs take up to 60 days to hatch and chicks take a further 60days before they learn to fly. what is more, the youngster is fed by the parents for many moths after it has learned to fly. annual breeding then is impossible. the harpy eagle does not face the same immediate threat as its filipino cousin. but if the destruction of its forest habitat continues at its present rate, the largest of avian predators, too, could join those birds already on the endangered species list. the british naturalist leslie brown wrote in 1976 that nearly half of the 59 species of eagle were under threat. 45£© . [a] this acutely threatened bird was reduced in numbers to fewer than 100 in the wild by the loss of its forest habitat and by the heavy demands of trophy hunters in the philippines. [b] but it has been seen carrying monkeys, sloth and even small deer back to its nest. [c] the monkey dies instantly, pierced by the talons. [d] folklore has long held that the harpy eagle preys on human babies as well as forest animals. [e] the result is an ability to see clearly a small monkey at a distance of up to 2.5 kilometres and to judge distances with pinpoint accuracy. $J_0%@XQ?XL: t~ [´Ë×ÊÁÏתÌùÓÚÑ§Ï°Íø¿¼ÑÐÒ»·½¿¼ÑÐÓ¢Óï ]http://www.Gzu521.Com$J_0%@XQ?XL: t~ [f] the harpy is very ferocious when its nest is threatened. [g] those who appreciate nature will be hopping that the harpy can surmount this threat, to soar on over the forests of south america. £Û´ð°¸Ïê½â £Ý 41. [c] ¿Õ°×ËùÔÚ¶ÎÂä½²µÄÊÇÓйØÈÈ´ø´óµñ²¶É±ºï×ÓµÄÀý×Ó£¬¶ø¿Õ°×¾äÓÖÊdzöÏÖÔÚ¶ÎÂäÖм䣬Òò´Ë£¬Ê×ÏÈ¿ÉÒÔÅжϳö¿Õ°×¾äµÄ»°ÌâÓ¦¸ÃÓ벶ɱºï×ÓÏà¹Ø¡£¿Õ°×Ç°ÃæµÄ¾ä×Ó˵´óµñ·¢Æð½ø¹¥£¬ÓÃÀûצץÆðÁÔÎºï×Ó£©£»¿Õ°×ºóÃæµÄ¾ä×Óȴ˵´óµñ°Ñºï×ÓµÄʬÌå´ø»Øµ½×Ô¼ºµÄ³²ÀѡÏî[c]˵µÄÊÇ¡°±»Àûצ´Ì´©µÄºï×ÓÇê¿Ì¼ä±ÐÃüÁË¡±£¬ÕâÕýºÃÓë¿Õ°×ǰºóµÄ¾ä×Ó×ÔÈ»µØÁ¬½ÓÔÚÒ»Æð£¬¹Êѡ֮¡£ 42. [b] µÚ3¶ÎÒ»¿ªÊ¼Ëµ¡°ÊDz»ÊÇÕâÖÖÁîÈËÉúηµÄÈÈ´ø´óµñͬÆäËûÓ¥ÀàÒ»ÑùÔÚ·ÉÏè¹ý³ÌÖв¶Ê³£¬»¹ÊǸöûÓж¨ÂÛµÄÎÊÌâ¡£¡±½Ó×ÅÓÖ˵ÒòΪ´óµñµÄÆÜÏ¢µØ±È½ÏÔ¶¡£ÈËÃǶԴóµñµÄÁ˽â±È¶ÔÆäËûÓ¥ÀàµÄÁ˽ⶼÉٵöࡣѡÏî[b]ÒÔbut¿ªÊ¼£¬±íÊ¾ÄæÇ°ËùÊöתÕÛµ½ÆäËûÄÚÈÝ£ºÈËÃÇȷʵ¼û¹ý´óµñ°Ñºï×Ó¡¢Ê÷Ì¡ÉõÖÁС¹´ø»Ø³²ÖС£[b]ÔÚÉÏÏÂÎÄÖÐתÕÛ×ÔÈ»£¬·ûºÏÎÄÒ壬¹Êѡ֮¡£ 43. [e] µÚ4¶ÎµÚ1¾ä»°ÊÇÈ«¶ÎµÄÖ÷Ìâ¾ä£¬¹Ø¼ü´ÊÊÇextraordinary eyesight£»½ô½Ó×ŵľä×ÓÓþßÌåÊý×ÖÀ´ËµÃ÷´óµñµÄ׿ԽÊÓÁ¦¡£µÚ4¶ÎµÄ¶Îβ¾ä£¬Ò²¼´¿Õ°×ºóÃæµÄ¾ä×ÓÀïÒ»¸öthe latter¿Ï¶¨ÊÇÖ¸¿Õ°×´¦¾ä×ÓÀïµÄºó°ë²¿·ÖÄÚÈÝ£¬ÓÉ´ËÒ²¿É¶Ï¶¨¿Õ°×´¦µÄ¾ä×ÓÖÁÉÙÓ¦°üº¬Á½¸ö·½ÃæµÄÄÚÈÝ¡£Ñ¡Ïî[e]±í´ïµÄÄÚÈݼÈÓë¶ÎÂäÖ÷Ìâ¾äÏàÎǺÏÓÖ·ûºÏ½áβ¾äµÄÒªÇ󣬿ÉÒÔÈ϶¨ÎªÕýÈ·´ð°¸¡£ 44. [a] ¿Õ°×ǰµÄ¾ä×ÓÀïÓÃÁËbe similar toºÍphilippines monkey-eating eagle£¬±íÃ÷±¾¶ÎÄÚÈÝÓ¦¸ÃÓëphilippines monkey-eating eagleµÄÓйØÇé¿öÏà¹Ø¡£Ñ¡Ïî[a]ÖеÄthis acutely threatened birdÕýÊÇָǰµÄ¾ä×Ó³öÏÖ¹ýµÄÄñÀ࣬ÕâÀïÖ¸·ÆÂɱöʳºïÓ¥£¬·ûºÏÉÏÏÂÎÄ£¬¹Êѡ֮¡£ 45. [g] ±¾¿Õ°×´¦ÓÚÈ«ÎĽá⣬ËùÒԴ˿յÄÑ¡ÔñÔڹ˼°Ëù´¦¶ÎÂäµÄÖÐÐÄ˼ÏëÖ®Ó໹Ӧ¸Ã¿¼ÂÇÈ«ÎĵÄÓïÆø¡£ÎÄÕÂ×îºóÒ»¶ÎÏÈ˵ÈÈ´ø´óµñ»¹Ã»ÓÐÊܵ½·ÆÂɱöʳºïÓ¥ÄÇÑùÆÈÔÚü½ÞµÄÍþв¡£µ«Èç¹ûÉÁÖ»·¾³ÒÔÏÖÔÚµÄËٶȼÌÐø»Ù»µÏÂÈ¥µÄ»°£¬ËüÒ²»áºÍÆäËûÄñÀàÒ»Ñù³ÉΪ±ôΣ¶¯ÎïµÄÒ»Ô±£»ËæºóÒýÓò©Îïѧ¼ÒµÄ¾ßÌåÊý¾ÝÇ¿µ÷´óµñËùÃæÁÙµÄÉú´æÎ£»úÓжàôÑÏÖØ£¬ÓÉ´Ë¿ÉÒÔÍÆ²â£¬×÷ÕßÔÚÓÐÒâµØÒýµ¼´ó¼Ò¡¢ºô»½´ó¼Ò×¢Òâ±£»¤ÉÁÖ»·¾³¡¢°®»¤¶¯ÎѡȡÏî[g]Êǽ谮»¤×ÔÈ»µÄÈËÃÇÖ®¿Ú±íʾÁË×÷ÕßÓÉÖÔµÄÃÀºÃÔ¸Íû£¬·ûºÏÎÄÒ壬¿ÉÒÔÈ·¶¨ÎªÕýÈ·´ð°¸¡£ ¾ä×ÓÌî¿ÕÐÂÌâÐÍÈ«ÕæÄ£ÄâÁ·Ï°ÆªÖ®¶þ directions in the following article, some sentences have been removed. for questions 1--5, choose the most suitable one from the list a--g to fit into each of the numbered blank. there are two extra choices, which do not fit in any of the gaps. mark your answers on answer sheet 1. (10 points) long before man lived on the earth, there were fishes, reptiles, birds, insects, and some mammals. although some of these mammals were ancestors of kinds living today, others are now extinct, that is, they have no descendants alive now. 1) _______________________________. very occasionally: the rocks show impression of skin, so that, apart from color; we can build up a reasonably accurate picture of an animal that died millions of years ago. the kind of rock in which the remains are found tells us much about the nature of the original land, often of the plants that grew on it, and even of its climate. 2) _______________________________. nearly all of the fossils that we know were preserved in rocks formed by water action, and most of these are of animals that lived in or near water. thus it follows that there must be many kinds of mammals, birds, and insects of which we know nothing. 3) _______________________________. there were also crab-like creatures, whose bodies were covered with a horny substance. the body segments each had two pairs of legs, one pair for walking on the sandy bottom, the other for swimming. the head was a kind of shield with a pair of compound eyes, often with thousands of lenses. they were usually an inch or two long but some were 2 feet. 4) _______________________________. of these, the ammonites are very interesting and important. they have a shell composed of many chambers, each representing a temporary home of the animal. as the young grew larger it grew a new chamber and sealed off the previous one. thousands of these can be seen in the rocks on the dorset coast. 5) _______________________________. about 75 million years ago the age of reptiles was over and most of the groups died out. the mammals quickly developed, and we can trace the evolution of many familiar animals such as the elephant and horse. many of the later mammals, though now extinct, were known to primitive man and were featured by him in cave paintings and on bone carvings. [a]the shellfish have a long history in the rock and many different kinds are known. [b]nevertheless, we know a great deal about many of them because their bones and shells have been preserved in the rocks as fossils. from them we can tell their size and shape, how they walked, the kind of food they ate. [c]the first animals with true backbones were the fishes, first known in the rocks of 375 million years ago. about 300 million years ago the amphibians, the animals able to live both on land and in water, appeared. they were giant, sometimes 8 feet long, and many of them lived in the swampy pools in which our coal seam, or layer formed. the amphibians gave rise to the reptiles and for nearly 150 million years these were the principal forms of life on land, in the sea, and in the air. [d]the best index fossils tend to be marine creatures. these animals evolved rapidly and spread over large areas of the world. [e]the earliest animals whose remains have been found were all very simple kinds and lived in the sea. later forms are more complex, and among these are the sea-lilies, relations of the star-fishes, which had long arms and were attached by a long stalk to the sea bed, or to rocks. [f]when an animal dies, the body, its bones, or shell, may often be carried away by streams into lakes or the sea and there get covered up by mud. if the animal lived in the sea its body would probably sink and be covered with mud. more and more mud would fall upon it until the bones or shell become embedded and preserved. [g]many factors can influence how fossils are preserved rocks. remains of an organism may be replaced by minerals, dissolved by an acidic solution to leave only their impression, simply reduced to a more stable form. ´ð°¸£ºbfeac
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