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[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ FGxg)&VYBf2 uQ gFroG] ÊÀ½çÉÏ×î¹ÅÀϵÄ×ã¼£[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ nfq4VuHE}Xeu€^-FroG] [ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ i2ud}=6'Xj"l=@FroG] ÓÐÃûÑÔ˵£º¡°ÕâÊÀ½çÉϱ¾Ã»Óз£¬×ßµÄÈ˶àÁË£¬Ò²¾Í³ÉÁË·¡£¡±²»ÂÛÊÇÈËÀ໹ÊǶ¯Î¶¼»áÔÚÕâ¸öÊÀ½çÉÏÁôÏÂ×Ô¼ºµÄ×ã¼£¡£ÄÇô¾¿¾¹ÊÇË¡¢ÔÚÄĶṳ̀³öÁËÕâÊÀ½çÉϵġ°µÚÒ»²½¡±ÄØ£¿[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ B89:&+xWY{oWfB$FroG] Scientists believe they have uncovered Earth's oldest known footprints in the mountains of Nevada£¨ÃÀ¹úÄÚ»ª´ïÖÝ£©¡ªa fossil find that suggests animals have been walking around about 30 million years longer than previously thought, according to new research.[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ /)5{cY,a wfnmhFroG] The controversial tracks¡ªdescribed by one skeptical scientist as "paired rows of dots"¡ª may indicate animals had legs in the late Protozoic£¨ÔÉú¶¯ÎïµÄ£© era, about 570 million years ago, according to lead researcher Loren Babcock.[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ b*HF,i_$FJ\?aSKt\5FroG] The discovery is the strongest evidence to suggest animals were able to move about on their own appendages during the Ediacaran period£¨°£µÏ¿¨À¼Í£©, before the Cambrian£¨º®Îä¼Í£© period "explosion." During the Cambrian complex animals rapidly emerged and replaced simple multicellular£¨¶àϸ°ûµÄ£© animals, said the Ohio State University professor.[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ R{/z[VPV%"TRtFroG] About 570 million years ago, the area was covered by a shallow sea. The water had a mat-like surface made of sediment£¨³ÁµíÎï¡¢³Á»ýÎ grains that were held together by a cohesive network of bacteria and fungi, which would have easily preserved animal tracks.[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ Qh.s7+%q=C MbS-r@FroG] The tracks were determined to have been made in the Ediacaran period by comparing the "footprints" layer to previously dated layers with similar features.[ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ )hEap/h0stLt_c]XFFroG] [ÎÄÕ°æÈ¨ ½ûÖ¹×ªÔØ:¿¼ÊÔÓëÆÀ¼Û http://www.trgroup.com.cn/te/ Br;cs1`k|M(RI9=-GFroG] |
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