Slavery was introduced in north america by the: spanish portuguese africans

Portuguese

Explanation:

Slavery was introduced to North America very early on by the Portuguese, who used slave labor when they tried to set up a trading post in South Carolina early in the sixteenth century. The slaves rebelled, however, and escaped. In 1619, a Dutch trader sold slaves to the Jamestown colony as indentured servants. From this beginning, slavery became part of the American culture for more than two hundred years.

i believe it d) heterogeneous

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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