TWO potential dangers you think present the greatest threat to the United States.

economy and terrorism

Explanation:

The economy has  These problems include global inequality and unequal economic development, global poverty, the exhaustion of non-renewable resources, depletion of the environment and global warming, and systemic problems associated with inadequate regulation of financial markets.

Terrorism has affected us since 9/11 as now we have metal ditectors  at airports and the situation with Afghanistan right now

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.