Life On Earth
- Created by: pxrklife
- Created on: 22-09-16 10:53
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- Life on Earth
- Early Conditions
- Nitrogen and CO2. Later, Methane, Ammonia, Hydrogen and Water Vapour
- High Temperatures
- volcanic Activity
- Thin Atmosphere- No ozone
- High levels of UV could enter
- Theories
- Miller
- Lightening made the gases react which created life
- UV radiation caused the gases to react
- Washed down gases created simple organic molecules
- Organic molecules collected in the oceans
- UNICELLULAR life forms
- Evolved into plants and animals
- Washed down gases created simple organic molecules
- Miller
- Pre-biotic Atmosphere
- Atmosphere was mainly CO2 and CH4
- CO2 declined and created limestone deposits
- CH4 also decreased
- Atmosphere was mainly CO2 and CH4
- Plants
- Photosynthesis released oxygen
- This created ozone (filters out UV)
- CO2 and CH4 decrease. O2 and 03 increased
- Evolution of Terrestrial Animal Life
- Aerobic respiration
- Photosynthesis released oxygen
- Water
- Why does it exist on Earth?
- Position from the Sun
- Natural Greenhouse Efeect maintains the temperature
- High SHC
- Heat is distributed around the world
- Importance
- Solvent
- Carries materials around the body and stores chemicals
- High SHC
- Heat is distributed around the world
- Maintains body Temperature
- Right temperature for enzyme activity
- Solvent
- Why does it exist on Earth?
- Light
- Importance
- Photosynthesis
- Basis of all food chains
- Importance
- Early Conditions
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