Which of these is an example of an achievement of antient india?

Ancient India was home to two of the world's first cities, Harappa and Mohenjo-Daro. These cities had stone buildings, multiply stories, and sewage systems! India was one of the very first civilizations to use algebra and calculus. The number zero was invented in Ancient India by a man named Aryabhatta.

c.) biotic: snails; abiotic: temperature climate

the policy of appeasement influenced the beginning of ww2 because hitler gave the other countrys chocies but after they choose to try and appease hitler to not invade their country but he still invaded them.