地球从产生到现在有哪些阶段?各阶段有何变化.有什么物种产生与灭亡 地球曾经五次物种大灭绝的理论解释。
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绛旓細2.51 鎭愰緳鍑虹幇锛涘嵉鐢熷摵涔冲姩鐗╁嚭鐜 26 渚忕綏绾 1.996 鏈夎绫诲摵涔冲姩鐗╁嚭鐜帮紱楦熺被鍑虹幇锛涜8瀛愭鐗╃箒鑽o紱琚瓙妞嶇墿鍑虹幇 27 鐧藉灘绾 0.996. 鎭愰緳鐨勭箒鑽e拰鐏粷銆佺櫧鍨╃邯-绗笁绾伃缁濅簨浠讹紝鍦扮悆涓45%鐢熺墿鐏粷锛屾湁鑳庣洏鐨勫摵涔冲姩鐗╁嚭鐜 28 鏂扮敓浠 0.655 鍒扮幇鍦 鍙傝冭祫鏂欙細鐧惧害鐧剧 ...