Effective listening
or maybe the term you are looking for is Critical Listening.
Not completely sure would need more context.
Answer:
the Natives located in Canada are the Inuit
Socially useful part of society.
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Savannas are a dry grassland surrounded by many deserts.
Answer:
The government wanted to keep the number of free and slave states equal so that neither of would throw off the balance of congress.
For example, if there was more slave states in congress, then most likely the laws would be made in favor of slavery.