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Viviparity is considered to be more evolved because:

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0%a. the young ones are left on their own
0%b. the young ones are protected by a thick shell
50%c. the young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival ( 1 voter )
50%d. the embryo takes a long time to develop ( 1 voter )
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  1. c. the young ones are protected inside the mother’s body and are looked after they are born leading to more chances of survival

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