From the explanations of ETS, E might be the right answer. But I think that D is right too or is even better than E. In the first paragraphy, the author mentioned that "All of the cells in a particular plant start out with the same complement of genes, how can they............". Fom my point of view, it is the oligoshchair that differentiates the structures of roots, leaves........... . So D cannot be evaluated as a wrong answer.
Informative explanations will be highly appreciated.作者: kenlily 时间: 2006-2-16 07:39
