Yeah, 1 billion days is only ~2.7 million years, so there were likely even early hominids at that time. So you're correct, and the list in the OP is not accurate.Interesting. However example 'd' is not correct. 1 billion days ago, in all likelyhood, there were animals that walked on 2 feet.
*edit. Somehow miscalculated a billion hours. That's 114,155 years, so I guess we were in the stone age. Haha. Don't know how I was off by 2 decimal places... :-\
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