Introduction 1. The Origin of Life and the Value of Life, Thomas R. Cech 2. Facing Nature, Dorion Sagan and Lynn Margulis 3. Mass Extinction and Human Responsibility, Niles Eldredge 4. Evolutionary Ethics: A Defense, Michael Ruse 5. The Difference in Being Human: Ethical Behavior as an Evolutionary By-product, Francisco J. Ayala 6.

When Natural Selection and Culture Conflict, Elliott Sober 7. Biology and Theology on Human Nature: Ethics and Genetics, Langdon Gilkey 8. Darwinism and Postmodern Theism, Charles Birch; Epilogue; Glossary.