Final answer:
By 2500 BCE, the significant developments in early Chinese civilization included advancements in pottery making and the creation of sophisticated jade ornaments. These developments were part of a broader societal growth that featured agricultural practices and social organization along major river valleys like the Yellow River.
Step-by-step explanation:
By 2500 BCE, early Chinese civilization observed significant developments such as advancements in pottery and the creation of sophisticated jade ornaments. Artisans in this period made clothing out of silk and hemp, created ceramics for ritualistic and practical purposes, and domesticated animals like pigs. Notably, the Yangshao culture demonstrated their influence by making pottery that played a role in rituals and daily life, while the Xinle culture in Manchuria is recognized for its refined jade works from as early as 3000 BCE. These artifacts from Neolithic China provide insights into the early settled communities, which thrived along river valleys such as the Yellow and Wei Rivers, where they engaged in agriculture and developed social structures.