early conditions on earth

• presence of liquid water

  temperature controls -> evaporation of water absorbs heat, causing temperatures to decline

  aquatic habitats -> oceans, seas, lakes

  absorption of UV radiation -> protected living organisms in the oceans before the ozone layer developed which absorbed UV in the stratosphere
• temperature range


  most areas of earth temperatures range from 0c and 35c
• atmospheric gases

  carbon dioxide for photosynthesis

  
  

  nitrogen for protein synthesis