What led to a population increase during the Song dynasty in China? A) The one child policy was lifted at the end of the Tang dynasty.

B) Buddhist monks were allowed to marry which led to increased family size.

C) A new form of rice was introduced that was drought resistant and yielded two crops a year.

D) Crops from the New World including the potato were introduced which led to longer life expectancy rates.

the answer is C

Explanation:your welcom

- "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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ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.