《科学》[Science]13年5月24日出版pdf全文

nero1981

# |) x1 M  j; u8 U% r) BCOVER A Classopollis meyeriana conifer pollen grain (~30 3 Y; J; K$ w0 ]' B
micrometers across) preserved in lake sediments deposited just after a massive,
: O3 a& k; j( kvolcano-induced extinction event ~200 million years ago. This fossilized pollen # u, s% Q, ^+ j
grain is representative of the low-diversity plant assemblages found within the
: }3 M( F* w3 T: j/ l; [tropics of the Pangean supercontinent during the postextinction recovery period.
/ a! L: ]  t/ J; }See page 941. Image:
/ o# o2 r! o5 y& V  S6 y* aDee Breger and Sarah Fowell/Science Source
$ F% `% @7 V; a: ^" f$ \

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yuheng

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懵懂干细胞

感谢楼主分享

zorro

thanks

eley

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100RMB

哎呀，找个资源不容易啊，谢谢先

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好好学习！