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  Life sciences timeline
     
c. 3 billion years ago
 
Narrative history in HistoryWorld    
Single-celled water creatures, such as algae, begin the 2-billion-year process of evolving into slightly more complex forms of life      
c. 1 billion years ago
 
Narrative history in HistoryWorld     
Sponges and jellyfish drift in the sea, to be joined later by more purposeful shrimps and lobsters       
c. 500 million years ago
 
Narrative history in HistoryWorld    
The earliest known creature with a skeleton evolves as a form of fish      
c. 400 million years ago
 
Narrative history in HistoryWorld    
Plants, previously living only in the seas and rivers, begin to establish themselves on land      
c. 350 million years ago
 
Narrative history in HistoryWorld    
Insects become the first creatures capable of living their full life span out of the water - and the first to master flight      
c. 340 million years ago
 
Narrative history in HistoryWorld    
Amphibians develop lungs, enabling them to live on land as well as in the water