According to Map 4.1, "The Geography of Historical China," the Neolithic settlements along which river may have experienced problems with flooding due to the increased probability of silt accumulation at the bottom of the river? 
Definitions:
Gender Identity
A person's internal perception and experience of their own gender, which may or may not correspond to their biological sex.
Appearance
The way in which individuals present themselves or are perceived by others, including physical looks, clothing, and grooming.
Genetic Composition
The total makeup of genes in an individual or organism, determining inherited characteristics.
Violence
The use of physical force or power to inflict harm, damage, or violate others, can occur at various levels including personal, community, and institutional.
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