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to change your ideas or behavior so that you can deal with a new situation
very different from each other
develop gradually, especially from a simple to a more complex form
an important part or characteristic of something
a group of people in society who are born and live around the same time
a natural characteristic of something
a movement from one place to another by a group of people or animals
related to the body or material things
a series of steps leading to a result
to stay alive despite an injury, illness, war, etc.