Why are the lupanine derivatives bitter ?
为
白金雀儿碱的派生物是苦的?
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:Periodic Videos
物学 In order for the sail to have been a shared derived character, it would have had to have been present in the common ancestor of all dinosaurs and then lost, possibly hundreds of times, in everything, except Spinosaurus, and Ouranosaurus.
为了使帆成为一个共享的
特征,
必须存在于所有恐龙的共同祖先中,然后在除棘龙和大王龙之外的所有恐龙中丢失,可能数百次。