The empire state building was the tallest building in new york city until the 1970s, when the world trade center towers were built. the united nations headquarters was built. the fulton fish market was created. the central park ice rink was created.

when the World Trade Center Towers were built.

its a

Explanation:

- "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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most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.