Describe three problems that led to the decline of the Mongol Empire?

After Kublai's death in 1294, the Mongol Empire fragmented. It had begun to decline significantly in the mid-14th century, however, after outbreak of the Black Death and the murder of one of its rulers. The Golden Horde finally broke apart into several smaller territories in the 15th century.

Explanation:

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.