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A free trial membership is available. An online interactive resource for biology covering Biochemistry, Cell Biology, Developmental Biology, Human Biology, Mendelian Genetics, Immunology, and Molecular Biology. A complete online laboratory manual, giving procedures for all manner of experiments in cell biology. Includes 15 chapters and a number of useful appendices. Cosmic Ancestory Cosmic Ancestry explores the idea that life on earth originated in outer space and was started here via bacteria on comets.