4 ms·

c'mon! while it is understandable that we all paid attention only to one lecture in the middle-school biology class - the one on human reproduction - one still

c'mon! while it is understandable that we all paid attention only to one lecture in the middle-school biology class - the one on human reproduction - one still is expected to remember that the life is almost 4B years old on our planet and 750M ago where would be various cell piles around thankful for the apple http://en.wikipedia.org/wiki/Timeline_of_evolution http://en.wikipedia.org/wiki/Timeline_of_evolution

iwwr 15y ago
Still, land was not being colonized at least until 500m years ago and substantial biomass had not accumulated until around 400 or so million years. 750m years ago there was probably not much microbial life on the continents (outside water holes or rivers, or near shores).