Answer:
A wave pattern organizes a speech
The answer is b. The sum of the individual gas pressure in the mixture
Answer:

The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen.
A. True
They are formed behind an obstacle when the wind blows the sand up to it.