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The first living things were bacteria, which appeared on earth about 3.5 billion years ago.

How do they know exactly how many years?

That's a mistery to me.

Whatever I just had nothing else to write about, haha, so I was doing my homework and I wanted to check this site, so I write the first thing I was thinking about, actually the second thing I was thinking about, cuz I was actually thinking about Alec!, man! how can I stop thinking about him? well.. that's just impossible so, whatever, I'm done.. thank you, thank you!!!!!