A new machine can bind books twice as quickly as a person can. Which economic question does this answer? For whom to produce? How much to produce?
How to produce?
What to produce?

the tallest building in the western hemisphere and the sixth tallest building in the world

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

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.