Characteristics of Life

  1. Reproduction:

   
   1. ^^Asexual^^

      
      1. Pros: fast, less resources, no male needed
      2. Cons: No genetic diversity
   2. ^^Sexual^^

      
      1. Pros: Genetic Variation
      2. Cons: Slow, more resources needed, mate selection, not many offspring

  1. Growth and development

   
   1. GrowthGrowth: increase in the number of cells
   2. DevelopmentDevelopment: changing forms

      
      1. Infant → toddler → child

  1. Energy processing

   
   1. ^^Metabolism^^: the sum of all chemical reactions

      
      1. ^^Catabolic^^: breaking down

         
         1. Digestion: protein → amino acids
         2. Cellular respiration: 6O2 + C6H12O6 → 6CO2 + H2O
      2. ^^Anabolic^^: building up

         
         1. Protein synthesis: amino acids → protein
         2. Photosynthesis: 6CO2 + H2O → C6H12O6 + 6O2

  1. Regulation

   
   1. HomeostasisHomeostasis: maintaining internal balance

      
      1. Temperature
      2. pH
      3. Salinity

  1. Response to stimuli: reacting to surroundings

   
   1. Using five senses

  1. Adaptation: change over time

   
   1. Evolution

  1. Organization: being made up of cells

   
    1. Atoms →

       
       1. Smallest form of an element
    2. Molecules →

       
       1. A compound of atoms
    3. ^^Cells^^ →

       
       1. ^^Smallest forms of life^^
    4. Tissue →

       
       1. Groups of cells
    5. Organs →

       
       1. Groups of tissues
    6. Organ systems →

       
       1. Groups of organs
    7. ^^Organisms^^ →

       
       1. All organ systems put together
    8. Populations →

       
       1. Same species in the same area at the same time
    9. Communities →

       
       1. Different species interacting in the same environment
   10. Ecosystems →

       
       1. Species interacting with the environment
   11. Biosphere →

       
       1. Earth