Which of these is NOT one of 5 relationships

Space is not completely empty. there are small particles in space. what happens when these particles come together?

How are the perspectives presented in the excerpts similar? they show the disappointment and fear mission control workers feel when the lunar module develops problems. they show the huge investment of time and energy mission control workers dedicated to the lunar module. they show how mission control workers view the lunar module as if it is the workers' very own child. they show the relief and excitement mission control workers feel when the lunar module lands on the moon.

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?