In the United States and elsewhere in the Western world, passive euthanasia is widely accepted. However, active euthanasia is a morally, politically, and legally debated issue. They all evolved. The student is expected to assume the truth of these evolutionary steps without any evidence being presented in the text. Text is heavy on use of terminology.
Evolution permeates the entire book.
This is a course in evolution. This book raises fundamental questions, but then gives no real answer. On pages 233-235 the authors raise critical questions about the spontaneous origin hypothesis. Instead of addressing the question directly, the paragraph following the question is devoted to a detailed discussion about dating rocks. No mention is made about the probability of life arising within the time frame judged available by these dating techniques.