What is Life? Consists of 8 Characteristics Life Cycle 1. Life Cycle- all organisms are born, grow, and die 2.Get Nutrients to Make Energy (ATP) - 4 main nutrients 4 main nutrients: Carbon (C), Hydrogen (H), Oxygen (O), and Nitrogen (N) How does this occur? How is energy made? Cellular Respiration Cellular Respirationa process by which nutrients are broken down [digestion] and energy is created; oxygen needed [breathing] Nutrients = Nutrients = food, water, and air Made of Cells 3. Made of Cells basic unit of structure and function Unicellular Unicellular = made of 1 cell Multicellular Multicellular = more than 1 cell Movement 4. Movement- move in some way at some point of life cycle plants Ex: plants- Venus fly trap, leaves turn toward sun, roots toward water Reproduce 5. Reproduce produce offspring to create new generation, prevent extinction asexual asexual- 1 parent sexual sexual- 2 parents if microscopic-use tiny hairs or body changes shape Excrete 6. Excrete- eliminate wastes [unused portions of what is taken in] to maintain healthy chemical balance 7. Respond to Changes in Environment 7. Respond to Changes in Environment-helps increase chance of survival Stimulus Stimulus- action organism reacts to [can be temperature, light, sound] Response- Response- reaction (IMMEDIATE) Ex: environment temperature rises [S], human sweats [R] Why is this important? Homeostasis- organism must be able to make constant adjustments to maintain stable conditions no matter what is occurring inside or outside of organism, if not survival decreases Teachers' Domain: Fever! Adapt Over Time 8. Adapt Over Time-any feature an organism inherits to help increase its chance of survival in its environment Ex: Ant eater- long snout & tongue Polar bear- white coat