[問題] evolution of insect flight
這段話
The study of insect is hampered by a gigantic gap in the fossil record.
Although fossils of early nonflying insects have been found in sediments
dating from the Devonian period nearly 400 million years ago, no insect
^^^^^^^^^^
fossils have turn up from the following 75-million-year period.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
問題為
How wide is the fossil gap?
答案為什麼是^^^說的75-million-year呢
謝謝
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