Time to Evolve
Age 14 to 16
Challenge Level 
Estimate lifespan and time to first offspring from those for the modern day equivalent creature.
Think about the point in the lifespan of a descendant at which the next descendant might have been produced.
Don't forget that this is an exercise in estimation and approximation: there is no 'right' answer, so try to put sensible guesses in the table.
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