Answrs to the Ten Questions.ppt

Answers to the Ten Questions * Q: ORIGIN OF LIFE. Why do textbooks claim that the 1953 Miller-Urey experiment shows how lifes building blocks may have formed on the early Earth -- when conditions on the early Earth were probably nothing like those used in the experiment, and the origin of life remains a mystery? A: The Miller-Urey experiment has been repeated many times with different chemically reducing “atmospheres” and the answer is always the same – it produces “biological” molecules. Also, how life originated is not strictly a question about evolution.  樱譬秦吏毖屯碌撮膊碟谍桔羡哎寒众骆覆应夺阑崎送恐殖沥叮弱束稽橇婶Answers to the Ten QuestionsAnswers to the Ten Questions Answers to the Ten Questions Q: DARWINS TREE OF LIFE. Why dont textbooks discuss the Cambrian explosion, in which all major animal groups appear together in the fossil record fully formed instead of branching from a common ancestor -- thus contradicting the evolutionary tree of life? A: Wells is wrong: fish, amphibians, reptiles, birds, and mammals all are post-Cambrian - arent these major groups? We would recognize very few of the Cambrian organisms as modern; they are in fact at the roots of the tree of life, showing the earliest appearances of some key features of groups of animals - but not all features and not all groups. 骗租镑印疤篷雷站故肠眺了稻您尾揣舍冈幂匹簧般描锚作铜鹤份嗽茹历癸Answers to the Ten QuestionsAnswers to the Ten Questions Answers to the Ten Questions Q: HOMOLOGY. Why do textbooks define homology as similarity due to common ancestry, then claim that it is evidence for common ancestry -- a circular argument masquerading as scientific evidence? A: Some textbook treatments are very simplified and are indeed circular. Homology can now be rigorously tested and provides strong support for evolution. 咎镐酒奄樱魏藻置腥蛛曼夕闹养瘪陕繁剑砰拓淡狗氧忘欠誉兹颗石胳碰皮Answers to the Ten QuestionsAnswers to the Ten Questions Answers to the Ten Questions Q: VERTEBRATE EMBRYOS. Why do textbooks use drawings of similarities in vertebrate embryos as evidence for their co