Q: Can you please explain question 4 on midterm 2? How do humans share common ancestry with dinosaurs then? Is it just a question of the fact that dinosaurs also were amniotes? Or that they are all vertebrates?
How do we know how far back "common ancestry" means?
Then can humans claim common ancestry with nearly every animal on our cladograms? Because they are all "animals"?
A: YES! We all share a common ancestry, and we can take it back as far as the Last Universal Common Ancestor (LUCA) that all living organisms on earth are thought to share.
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