Which piece of evidence from the passage supports the theory that humans may not have been responsible for the extinction of the woolly mammoth? a. discovery of sites of mass mammoth kills a. discovery of sites of mass mammoth kills b. a land bridge that connected asia to north america b. a land bridge that connected asia to north america c. discovery of traces of ancient mammoth dna in alaska dating to 10,500 years ago c. discovery of traces of ancient mammoth dna in alaska dating to 10,500 years ago d. carbon dating that indicates the mammoths died between 13,000 and 15,000 years ago d. carbon dating that indicates the mammoths died between 13,000 and 15,000 years ago