Answer:
It allowed people to settle down.
Explanation:
Domesticating livestock allowed people to settle down and build a more stable living environment, instead of being hunters and gatherers. Because people no long had to constantly travel for food they had safer lives and died less. They were also able to have more kids because they now had a stable food source. This allowed the community to grow and evolve until they became civilizations.
Hope this helps, let me know if you need more of explanation,
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- - William the Conqueror was considered an important monarch because he took down/seized the throne to England.