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We learn from the passage that ....... .
Camels and their relatives, such as the llama and the vicuna, were domesticated about 4000 to
6000 years ago. Ever since, they have provided meat, milk, wool and hides to various desert- and
mountain-dwelling peoples of the Eastern and Western Hemispheres. Ancestors of the camel
family lived in North America during a period that began about 54,000,000 years ago. Their
remains show a steady development from tiny creatures no larger than rabbits to the large beasts
of today. At some time before about 2.5 million years ago, one group migrated to Asia across a
land bridge that once existed over the Bering Strait. These animals eventually developed into the
camels proper. Another group migrated to South America. These developed into the llamas and
vicuna of today. Later, camels died out in North America.