Sự sống xuất hiện trước khi có khí oxi
Sự sống đã tồn tại dưới lòng đại dương khoảng 200 triệu năm trước khi không khí trên Trái đất trở nên thích hợp cho sự hô hấp, một nghiên cứu mới đây cho hay.Sự sống xuất hiện trong Liên đại Thái cổ, khi Mặt trăng còn ở rất gần Trái đất và bầu khí quyển ngập tràn các loại khí độc hại.Trong suốt Liên đại thái cổ, toàn bộ Trái đất ngập tràn khí mêtan, ammoniac và các loại khí độc hại. Với điều kiện đó, không thể có bất kì sinh vật nào tồn tại được.
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