The main reason for economic failure of the soviet union was

It could not send in Soviet troops to put down the rebellions against communism in Eastern Europe because such an action would have resulted in a refusal of Western sources to lend the money needed. Gorbachev's failure to implement effective reforms led to Russian nationalism which yeltsin exploited.

Explanation:

c) they were beaten and fired from their jobs.

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.