It is due to their ability to adapt in the varying circumstances
Pharos is a pretty good choice
<span>The original Constitution had senators being picked by state legislators. The Senate was supposed to be the 'more deliberative' house, the adult supervision for the House of Representatives. In 1913 the 17th amendment went into effect, allowing senators to be elected directly by the people.</span>
That's not a question...and it doesn't belong in history, it belongs in Math.
The plan was the Great compromise.