【问题】： (D) 69. A researcher is trying to construct a molecular-based phylogeny of the entire animal kingdom.Assuming that none of the following genes is absolutely conserved, which of the following would bethe best choice on which to base the phylogeny? (A) genes involved in eye-lens synthesis (B) genes that cause radial body symmetry (C) genes involved in chitin synthesis (D) collagen genes (E) beta-catenin genes (D) 65. All of the followings have contributed to the diversity of organisms on the Hawaiian archipelago EXCEPT that (A) The islands are distant from the mainland. (B) Multiple invasions have occurred. (C) Adaptive radiation has occurred. (D) The islands are very young in geologic time. (E) Environmental conditions differ from one island to the next. (E) 62. Birds and mammals both have negative pressure breathing, but birds are more efficient because of which of the following reasons? (A) The bird’s mouth movements are able to force air into the lungs. (B) The tidal volume in birds is much larger than in a comparably sized mammal. (C) The flow of air in a bird’s lungs is from posterior to anterior. (D) The brain of the bird maximizes oxygen uptake more efficiently. (E) The maximum PO2 is significantly higher in bird lungs. 【问题起因】： 69. 不知(A)(E) 为何不可 不是动物也几乎都有吗?? 65. (A) 远大陆的 不是也会造成多样性下降吗?? 62. (C) 鸟类用前後气囊造成单一流向 为何不可?? PS 第一次po 文在板上 看板规好像是可以问问题 若不妥 立刻删除 --

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