The ability for some animals to have live
births versus eggs can normally be explained by
what classification the animal belongs to.
Mammals have live births, birds have eggs, Echidn
as (a relative of mammals, think platypus)have
eggs (like birds) but also have some
characteristics only seen in mammals (fur and milk
for their young). There are some classification
of animals that can have either live birth or
eggs, such as sharks, fish and some reptiles. The
difference between the whether there are live
births versus eggs is usually determined by the
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