Audience: Students; Grades: 6-8; Subject: Science. (2003) Looks at the daily and yearly cycles carried out by living things, as well as the natural cycles of the environment. Explains circadian rhythms and the daily patterns of nocturnal and diurnal animals. Discusses the annual rhythms of plants and animals, including hibernation, estivation, and migration. Also explains the water cycle, the oxygen and carbon cycle, and the nitrogen cycle. Program concludes with a 10-question video quiz. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLfM0toUHJnUjduS3M&usp=sharing