(May 12, 2018 at 2:07 pm)CDF47 Wrote: Doesn't mean the graph is accurate or correct.
It represents the age of the corresponding fossils. And do keep in mind that, for each of those species, there are various specimens and all agree with respects to their age.
Considering how unlikely fossilization is, we can infer that a considerable population existed of each species at each "era".