This text enables readers to form their own ideas of evolution by plotting the course of biological change from the ancient time to the present. It explains the contributions of the great thinkers of the past and present, ranging from Darwin and Mendel, to Watson and Crick. There is good coverage of modern-day principles and biochemical explanations for evolution. Greenwood Guides are especially appropriate for use as reference materials. Because it has been 150 years since the publication of Origin of Species and recently was Darwin's 200th birthday, every school should ensure that they have up-to-date and comprehensive references like this.