If you're studying the science of sound, you're studying which of the following?
a. pitch
b. wavelength
c. frequency
d. acoustics

Which example define natural rights ?

In the years after world war ii, which of the following caused many people from asian and african countries to migrate to europe? a. the end of the soviet union b. new economic opportunities after colonialism ended c. the religious freedom found in europe d. new laws allowing greater numbers of immigrants into european countries

Arecent challenge to the european union created by a member state is?