When two notes are played simultaneously, creating a harmonic sound, it is called acoustics consonance timbre dissonance?

Music plz match the musical term on the left with its definition on the right.

The opening section sounds marchlike, with accented beats and alternations between instrumental groups. eventually, a total change of character marks a short, new section. at approximately which time interval from the beginning does this appear?

How can caregivers arrange the room to facilitate play? ece