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