Question

Evidence comparing american english, german, and mandarin chinese speakers shows that in each language, a mother's pitch _________ when a mother is attempting to get an infant's attention and ________ when she is try to calm an infant.

Answer 1

I believe the answer is: rises; falls

The rising and falling intonation tend happen naturally and would convey the same message across many different culture in the world.
This indicates that some forms of communication and emotion tend to be biologically based rather than socially formed.