Characteristics of Life

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

Growth and development

1. Growth: increase in the number of cells

2. Development: changing forms

   1. Infant → toddler → child

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

Regulation

1. Homeostasis: maintaining internal balance

   1. Temperature
   2. pH
   3. Salinity

Response to stimuli: reacting to surroundings

1. Using five senses

Adaptation: change over time

1. Evolution

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