What was the main purpose of acropolis?

to be a public gathering place

Here is the one for Parthenon for my fellow Edgenuity peeps: to honor the godess athena.

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.