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Not all animals grow in the same way. Some animals change gradually over time. As
they grow, they keep the same general physical structure. Humans are
an example of this. Other animals, however, experience abrupt changes to their body.
Frogs for example, hatch from the egg as a tadpole. They grow legs and by the time
they are an adult, their body looks completely different. Butterflies grow in different way
again. A caterpillar hatches from the egg. Eventually it forms a chrysalis and emerges
as a butterfly​