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'Time to Evolve' printed from http://nrich.maths.org/
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.