Which best describes the reaction A+B+C+energy —> ABC

Endothermic reaction

Explanation:

An endothermic reaction is one that require the input of energy to yield products.

So, A+B+C+energy --> ABC is an endothermic reaction since energy was supplied before it could yield the product ABC

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.