Why does the author use the word "luckily"in mentioning that the Ambulocetus natans fossil included hind legs?
Result:
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Option 2: "The legs provided important information about the evolution of cetaceans."
Explanation: This option is correct as the text implies that the hind legs of Ambulocetus natans are significant for understanding the evolution of cetaceans. The phrase 'luckily' suggests that having these legs in the fossil provides valuable insights into how early whales adapted both on land and in water.
Option 1: "Fossil legs of early whales are a rare find."
Explanation: This option is incorrect because the text does not mention the rarity of fossil legs of early whales. Instead, it focuses on the significance of the hind legs found in the Ambulocetus natans fossil.
Option 3: "The discovery allowed scientists to reconstruct a complete evolution of the whale."
Explanation: This option is also correct because the text indicates that the fossil's hind legs contribute to the understanding of the evolutionary link between land and sea life. The presence of these legs helps scientists piece together the evolutionary history of whales, supporting the idea of reconstructing their evolution.
Option 4: "Until that time, only the front legs of early whales had been discovered."
Explanation: This option is incorrect as the text does not state that only front legs had been discovered prior to this find. It focuses on the significance of the hind legs found in this particular fossil, rather than the history of discoveries of whale fossils.
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