How is government in the United States today different from government in ancient Athens? The United States is a direct democracy.
The United States allows citizens to vote.
The United States is a republic.
The United States has a unicameral legislature.

the answer wold be b) travel among nations should be regulated by an international organization

bujías y una hora antes y no me parece muy difícil

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.