One day in 2006, Natalia Rybczynski was digging at a site less than ____ degrees south of the North Pole when she found a strange object. To begin with, she thought it was a piece of ____. She collected more fragments over the next four years and eventually used a ____ to find out that it was a ____ of a huge mammal. When they cut a piece off one fragment, they ____ collagen, which is a substance found in bones and which ____ in the ice. A couple of years later, she sent the fragments to a colleague who had invented a technique called ____, which can identify an animal from a bone. They discovered it was a(n) ____ million-year-old camel and that it must have weighed ____, which is ____ percent larger than camels today.

Perspectives 3. Unit 4D. Student book . Exercise 4, p. 76 (based on video 6.1)

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