The Biological Clock

Biological rhythms, like the opening and closing of flowers happen all over nature. But not all of them are daily rhythms. Some, like the beating of our heart, occur every second. Other rhythms are based on months, seasons or years.

Contents : 4  pages

• Text
• Exercises
• Key

Downloadable Sample of the Full Module (Not Printable) :

• The Biological Clock  - Text  (PDF 148  KB)
  
• The Biological Clock   - Exercises  (PDF  130  KB)