1) there are more habitats for animals
2) trees provide oxygen so there is more oxygen for the world : )
in this way, geography kept early china culturally and economically isolated from the rest the world. however, ancient chinese civilizations were exposed to the sheep and cattle herders inhabiting the grasslands in the northwest, and the fishing cultures along the southeast coasts.
the second choice because if you build a lake before building houses then the lake will tear apart the houses.