Bài ôn tập số 1

The camel-like llama once inhabited North America, but disappeared during the last ice age. However, it survived in South America, where the Incas used it for various purposes. They domesticated the llama as early as 6,000 years ago and developed close ties with the animal. By 600 A.D.,. the animals had become essential as beasts of burden for farmers and villagers to transport food products and construction materials. A large male animal could carry approximately 30 kilograms of cargo 20 kilometres in a day. Though the pace was not great, their trainability made them more suited to the task than any other animals. The llamas greatly alleviated the burden of carrying or hauling materials across significant distances by hand

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