GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - THRA5OE14W4CBO2SJ

According to the passage, which of the following is true of Lymnaea peregra? A. Handedness within the species was at one time equally distributed between left and right. B. Under laboratory conditions, dextral eggs from Lymnaea peregra can be artificially induced to develop into sinistral snails. C. Broods of Lymnaea peregra are, without variation, exclusively sinistral or dextral. D. Handedness in Lymnaea peregra offspring is determined by only one of the parents. E. Geographic factors have played a larger role than has genetics in the evolution of the species.