Which section of the orchestra is considered the foundation because of its unique timbre? strings brass percussion woodwinds

Either the percussion or strings, specifically cello section.

The percussion section often provides a repeating rhythm or ostinato that holds intact the rhythmic meter of a piece played by the orchestra.

The cello section will play important down beats and roots of harmonic chords that spread within the different part of the orchestra. 

Afree throw is worth one point, a 3 pointer is worth 3 points, and a 2 pointer is worth 2 points.