neat blue dog,
"4: Pretty much all researchers agree that civilization began to record their history only less than 5,000 years ago, and for some reason the humans in the thousands of years before that didn't."
There are cave paintings that are tens of thousands of years old.
"Explain how a plant that ok can be dated with pinpoint certainty."
Tree rings. They overlap in fossilized trees. There's a whole field of science that deals with that. It's called dendrochronology.
"who said saber tooth tigers ate grass?"
Most young earth creationists claim that there were no predators before the Fall and that lions ate grass and tyrannosaurus ate palm trees or their coconuts.