In the first half of the 19th century, why did the u. s. congress work to keep a balance between the number of slaveholding states and free states?

If supporters of slavery or abolition had more representatives in the U.S. Congress, they would have their way on the issue.

View attached pic for proof

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.