Answer: yes
Explanation:
you can weigh air inside a container. density is determined by pressure/humidity
Answer:
D.
overseeing joint sessions of congress
I believe the answer is:
The Affordability Of Cell Phone Service
The widespread availability of the Internet in homes
Before these two exist, it is difficult for people to obtain new information and contact other people in different regions. After the development, we could even easily contacted other people in different countries and the flow information could happen with one single touch from our hand