Final answer:
Many of the early people who migrated to North America over a land bridge were nomads who followed herds of animals.
Step-by-step explanation:
The phrase that best describes many of the early people who migrated to North America over a land bridge is Nomads who followed herds of animals. These early people were mainly hunter-gatherers who depended on the migration patterns of animals for food and resources. They followed the herds across the land bridge that connected Asia and North America thousands of years ago.
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