''Have you got any information about some really, really cold periods? Like how much lower do sea levels go?''
google is free
the timeline of hominids is easily seen
the rise of mammals is easily seen
that the probability of hominoids couldn't survive in the period where dinosaurs thrived is easily seen
that humans and other hominids survived much in ice ages is easily seen -
it can also be easily seen on the ground if you go to the right places
why ask someone on social media - when you have the equivalent of better than a state library right in front of you when you are reading this?
as to looking for things like how low do SL's go etc -------- what's far more important is how humans and hominids survived the range of survivable conditions -
what they did, how they adapted and where they moved and how
far too much for a post on hc ---------- but, one can read for weeks and travel for years to see
