Answer:
timbre
Explanation:
The timbre is associated with the waveform and allows us to distinguish sounds of the same frequency produced by different instruments or similar voices from different people. The tone is characterized by the composition of frequencies that constitute the sound wave emitted by the instrument, or by the voice. The tone is also called sound quality. For this reason, when Fred says he can differentiate his mother's voice from his sister's because of the difference in voice quality, Fred is referring to the Timbre.
It is probably ,Venezuela’s economy is more unstable then Brazil’s
