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20101017иԇxC(j)(jng)ؑ

r(sh)g2010-10-19 10:02:00   (li)Դo(w)nW(wng)     [wС ]
1017иԇ˚gϲ˱¾1017иԇC(j)(jng)ϣ܎(li)



(li)1017иԇxC(j)(jng)



һƪprehistoric diet



P1,many ways to know the prehistoric diet, one way--indirect---ͨ^(gu)(dng)r(sh)natural environmentr(nng)I(y)Դ֪ʲô(})however,the flaw of this method---can't know what's the most important part of their diet(})



P2,another way--direct--ͨ^(gu)food remains in the garbage heaps or other sites---problem: the food remains usuallly fragile(~R})--a solution by scientists: һBһȡ،(sh)(yn)һNliquidʹ֮x?yn)food remainsorganic@Nliquid渡(li)(Ӻ(jin)})



P3,ͨ^(gu)Xwear on the teethõgeneral info about their diet, for example, dog teeth---meat(})



ڶƪmorphography



P1 same species of plant,different in different light conditions



P2, two examples can only live well in specific light environment while others can adapt to various light conditions



P3, moss L(zhng)L(zhng)stem--@elongationڏ(qing)L(zhng)diameter



P4ԞIJ(hu)@Nr~(sh)Ҳ(hu)չʾelongationand they can compete for light



ƪ



p1ǰһֱԞןo(w)19th century l(f)F(xin)һ(g)Ȼlead to many researches



p2ǰһֱԞﶼСsnailswormsǺ(li)l(f)F(xin)䌍(sh)ǺҰUreason: lack of competition, abundance in food and lack of juvenile(}@(g)~ҪJ(rn)R(sh))



p3,antarctic l(f)F(xin)ȻϰٷN~(y)



P4AntarcticaһNbarrierKˮ~(y)ȥwarm~(y)M(jn)(li)ȻůҲ(hu)M(jn)(li)@Щ~(y)һNspecial blood protein which bind to the crystal so that they can survive



P5,׵bacteriaorganismǧpressure,ŵС300pressureĕr(sh)