返回列表 发帖

GWD-8-33

Q33: In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow. Which of the following, if true, most helps to explain the surprising finding? A. Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs. B. Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest. C. The strength of the tidal currents in a given location varies widely over the course of a day. D. A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food. E. Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year. Answer: E

感觉给出的答案一点关系没有。请朋友们帮忙分析分析

收藏 分享

不好意思,终于理解了,原来是换壳了。谢谢

TOP

返回列表

站长推荐 关闭


美国top10 MBA VIP申请服务

自2003年开始提供 MBA 申请服务以来,保持着90% 以上的成功率,其中Top10 MBA服务成功率更是高达95%


查看