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Title: Chapter 5: Major Biological Innovations in the History of Life on Earth

Journal Article · · Astrobiology
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Georgia Institute of Technology, Atlanta, GA (United States)
  2. University of Wisconsin, Madison, WI (United States)
  3. Montana State University, Bozeman, MT (United States)
  4. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate

All organisms living on Earth descended from a single, common ancestral population of cells, known as LUCA—the last universal common ancestor. Since its emergence, the diversity and complexity of life have increased dramatically. Here this chapter focuses on four key biological innovations throughout Earth's history that had a significant impact on the expansion of phylogenetic diversity, organismal complexity, and ecospace habitation. First is the emergence of the last universal common ancestor, LUCA, which laid the foundation for all life-forms on Earth. Second is the evolution of oxygenic photosynthesis, which resulted in global geochemical and biological transformations. Third is the appearance of a new type of cell—the eukaryotic cell—which led to the origin of a new domain of life and the basis for complex multicellularity. Fourth is the multiple independent origins of multicellularity, resulting in the emergence of a new level of complex individuality. A discussion of these four key events will improve our understanding of the intertwined history of our planet and its inhabitants and better inform the extent to which we can expect life at different degrees of diversity and complexity elsewhere.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Aeronautics and Space Administration (NASA); National Institutes of Health (NIH); David and Lucile Packard Foundation; National Institute of Aging (NIA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-07NA27344; 1R35GM138030; NNA17BB05A; 80NSSC18K1139; NNX17AK85G; 80NSSC20K1365
OSTI ID:
2341946
Report Number(s):
LLNL-JRNL-825388; 1039423
Journal Information:
Astrobiology, Vol. 24, Issue S1; ISSN 1531-1074
Publisher:
Mary Ann Liebert, Inc.Copyright Statement
Country of Publication:
United States
Language:
English

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