OHS 2019 Chap1

How do we know that our human story began 7 million years ago?
Why does only our species on the human lineage still exist and not the other ones? p.18-19
Are there other features than anatomical ones that can be shared by two distinct species ? p.9
If the common ancestor is considered as a hypothetical ancestor, how can we be sure that apes are our "cousins"? p.9
How did the environment put pressure on species of the human lineage? What sort of pressure it can be for instance? How one can visualize it?
On page 13, you mentioned " Because of the variation seen in living and fossil apes, scientists can't be sure that the last common ancestor of chimpanzees and humans was a knuckle walker". If there is a significant variation between living and fossil apes, why don't we consider them as two different species? Why do we have lots of extinct species in the human lineage and not in the ape lineage? Is there a reason for that?
Since the common ancestor is a concept, why do we focus on it, on his mean of walking?
When a scientist finds a fossil what conclusion can he draw from it?
What are the best conditions for remains to fossilize?
What was the most recent major discovery that changed our perception of the past?
What are the exact anatomical features that are similar between Homo sapiens, chimpazees and gorillas?
Are the molecular clocks reliable to date the apparition of a new species

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