Earthworms: Grades 6-8

" Reissue with new ISBNThis humane and wiggly GEMS unit goes to the heart (and circulation) of the common earthworm, and explores this creature's critical role in the cycle of decomposition and soil renewal. Without dissection or harm of any kind to the animal, students study the movement of blood through observable vessels, assess its pulse rate in response to modest temperature changes and graph the results, and in learn of its marvelous adaptability to environmental conditions.In discussing why earthworms respond as they do, students learn about cold-blooded (poikilothermic) animals, the concept of adaptation, and circulatory systems. Background sections include concise biological information on earthworms and guidance in their care.Robert C. Knott is a longtime biology educator, science curriculum developer, and science center administrator who served in leadership roles at the Lawrence Hall of Science and the GEMS Program. He is also an author of the popular GEMS guide "River Cutters."Also available by Robert C. Knott"River Cutters"PB $16.00, 0-924886-32-3" CUSA