four rhythms in nature: day-nights rhythm, tidal rhythm and seasonal rhythm.

　　+ another rhythm that cant be seen: gravitational rhythm.

　　day-nights change is periodical and rhythmical.

　　called day-nights rhythm of nature.

　　Some animals do activities at night and rest at daytime, for example, owl, vole, roach, bat

　　Some animals do activities at daytime and rest at night, for example, chicken, duck, pig

　　day-nights biorhythm of animal is controlled by biological clock in its body.

　　Scientists did a test for roaches in order to set biological clock of animal back or forward.

　　Roach is an insect which rests at daytime and works at night.

　　Scientists put some roaches into a test room and reversed artificially the order of day and night in the test room.

　　finally, the roaches just worked in the artificial dark night time even though it was a daytime in fact.

　　Tidal rhythm of nature.

　　Tide comes in or goes out by a regular way

　　Every tide always comes later 50 minutes than last one. Namely, the cycle of tidal rhythm is 24 hours 50 minutes .

　　small crab in seabeach; living in a tidal environment; avoid tidal strike for life.

　　By training and adaptation for a long time, it follows the tidal rule.

【Harvey的阅读回忆：Rhythms of Nature】相关文章：

★ 2015年雅思阅读长难句解析

★ 雅思阅读考前必看—A Drier and Hotter Future

★ 雅思阅读：判断类题型解题技巧（下）

★ 雅思阅读真题预测

★ 雅思阅读考前必看—Volt farce

★ 考场上应对雅思阅读 的策略

★ 雅思阅读考前必看—Whirly-splat

★ 雅思阅读考前必看—Runaway Devils Lake

★ 雅思阅读：有针对性复习 有效提高技法

★ 雅思阅读考前必看—What‘s in store