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Introduction to astrobiology
This note covers the following topics: Properties of life, The cell, Life definitions in astrobiology, Chemical properties of life, The chemical elements of life, The water molecule, Chemical bonds in biology, Functional groups in biomolecules, Biological macromolecules, Nucleic acids: RNA and DNA, Molecules used for energy exchange, Genetic sequences and classification of organisms.
Author(s): Giovanni Vladilo
38 Pages 
This book 'Man's Place in the Universe' is a study of the Results of Scientific Research in Relation to the Unity or Plurality of Worlds.
Author(s): Alfred R. Wallace
NA Pages
Astrobiology Origin and Evolution of Habitable
This note describes the origin and development of life on the planet Earth within the context of an evolving universe. It begins with an overview of the origins of the universe from the "Big Bang" to our own solar system and then integrate the principles of physics, chemistry, geology and biology to study the origins of life on Earth.
Author(s): Professor Dr. Harold Geller
NA Pages