Why might member at congress attach a rider to a bill

Riders are usually created as a tactic to pass a controversial provision that would not pass as its own bill. Occasionally, a controversial provision is attached to a bill not to be passed itself but to prevent the bill from being passed (in which case it is called a wrecking amendment or poison pill).

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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.