Levels of Biological OrganizationNAS-3 & 17           [REDUCTIONISMNAS-4]        We have lots of entry points to our study of Life and the Biology of Organisms.        BIOSPHERE...   all the environments of planet Earth that are inhabited by life                 ecosystem...  (ex: tropical rain forest)                                                                 biotic factors      =   all organisms living in an area                                       abiotic factors    =   physical components of environment                 community...     all the organisms in the system                 population...      all interbreeding individuals of one species      ORGANISM...   an individual living entity                          organ systems...  circulatory, nervous, respiratory systems, etc                                 organ...                  parts of the organ system : brain, spinal cord, nerves                 tissue...                  individual groups of similar cells, with specific function      CELL...  ultimate unit of living matter, bounded by membrane, containing:                 macromolecule...  polymers of biological molecules...                                                   carbohydrates, lipids, proteins, nucleic acids                 molecules...     a cluster of atoms with unique chemical properties                 atom...             smallest unit of matter with same atomic number                 sub-atomic...      protons, neutrons, electrons (quarks, etc...)                                        c10e.fig 1.3               Biomass by organisms on Earth   back  Bb   next lecture                            copyright c2023    Last update - Tuesday, March 16, 2022             Charles Mallery,   Biology 150, Department of Biology,   University of Miami,  Coral Gables, FL 33124