Final answer:
Admiral Zheng He returned to China with knowledge of distant lands, rare plants, and animals, as well as valuable gifts for foreign rulers.
Step-by-step explanation:
Admiral Zheng He returned to China with various information and items from his seven naval expeditions between 1405 and 1433, commissioned by the Ming Emperor Zhu Di.
He brought back knowledge about distant lands, rare plants, and animals, including herbs from Egypt that could be used to fight a smallpox outbreak in China.
Additionally, he presented foreign rulers with gifts such as porcelain, silk, gold, ivory, and exotic animals like zebras and ostriches.