Final answer:
The areas of a continent that are generally populated are those with favorable conditions for human habitation. The first colonists settled on the Eastern side of North America for several advantages. Population density variation is caused by distribution patterns, colonization patterns, and environmental factors.
Step-by-step explanation:
The areas of a continent that are generally populated are typically those that have favorable conditions for human habitation, such as access to water, fertile land, and favorable climate. The first colonists settled on the Eastern side of North America because it offered several advantages, including a milder climate, abundant natural resources, and proximity to Europe for trade and communication. The variation of population density is caused by several factors, including population distribution patterns, colonization patterns, and environmental factors.