Which physical feature made trade difficult with lands north of China? the Gobi desert
the Plateau of Tibet
the North China Plain
the Himalayas

the gobi desert

Explanation:

it's the gobi desert cause they made it difficult to trade across long distance

can you post options so i can ?

the of atp are the key to its ability to store and supply energy;

phosphate

the phosphate groups of atp are the key to its ability to store and supply energy. atp releases energy when it breaks bonds between its phosphate groups.