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

2. Growth and development

       1. $Growth$: increase in the number of cells    2. $Development$: changing forms

             1. Infant → toddler → child

3. 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

4. Regulation

       1. $Homeostasis$: maintaining internal balance

             1. Temperature       2. pH       3. Salinity

5. Response to stimuli: reacting to surroundings

       1. Using five senses

6. Adaptation: change over time

       1. Evolution

7. 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

\