Answer:
A device designed to transmit electromagnetic waves through the air should be developed.
Answer:
Hello, Your answer is <em>B) Making observations</em>
<u><em>(Hope That Helps Your Answer)</em></u>
Answer:

Explanation:
For this question, we must use Dalton's Law of Partial Pressures:
The partial pressure of a gas in a mixture of gases equals its mole fraction times the total pressure:

Data:
χ = 0.7808

Calculation:

Iron oxide!!!!!!!!!!!!!!!!!!!!