The evolution of the shelled, waterproof egg was an important event in vertebrate evolution because it

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    was the first example of parents caring for their young
    allowed the colonization of freshwater environments
    freed organisms from having to lay their eggs in water
    led to the Cambrian explosion
    allowed internal fertilization of eggs

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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freed organisms from having to lay their eggs in water
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)



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