Sự sống trên Trái Đất có thể đã bắt đầu từ hơn 4 tỷ năm trước
Sự sống có thể đã tồn tại trên Trái Đất từ cách đây 4,1 tỷ năm chứ không phải chỉ 3,8 tỷ năm như những ước tính được đưa ra trước đây.
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