In bats, early skin flaps probably would have been functional for gliding but not in powered flight (e.g., Bishop 2008).
Although the railways had been functional for the duration of the war, Muslim and Croat politicians could not decide who would operate them.
Therefore, they have an origin that occurred before the separation of the mammals and birds lineages and have been functional for 310 million years (My).
We identified 28 gene losses that have been functional for more than 170 million years, a time period that extends from platypus to human.
Second, the ARGFX locus may have been functional for the entire evolutionary history of humans, and is still functional, but has become a pseudogene (or has been lost) in many independent mammalian lineages.
For the 28 canine-specific gene losses that have been functional for more than 170 My, we determined the functional annotation of the human genes using WebGestalt, a Web-based gene set analysis toolkit [ 48].
A commercial e-Commerce system has been functional and ready for apparel, automobile and mobile phones.
However, this perspective, while it may have been functional and beneficial for the past few thousand years, has become constraining, like a box.
