What does average mean in science terms?

Which of the following is an example of Darwin's theory of evolution by natural selection? Why is a towel a good material to dry himself with? Who is Rudolf virchow parents? What are the Main social factors affecting communication? What does the word physical change mean? Can water vapor and gasoline vapors be mixed if so will the explosive power of the two vapors mixed increase in any way? There is no fire without smoke is true? What impact did the light bulb have on daily life? What are the two types of cells found at the retina and what are their functions? What step comes between identifying a need and generating ideas in the technological design process? What problem would using garbage as a a biomass fuel help solve? What is acromegly? If a light bulb is missing or broken in a series circuitwill the other bulb light? What is the unit of Hardgrove Grindability Index? Reconcile the fact that friction acts in a direction to oppose motion even though you rely on friction to propel you forward when walking? How many gallons does the average dishwasher use? What is 34 Celsius degrees in Fahrenheit? You have 282000 kilometers on your car what is that in miles? How do scientific displines differ from nonscientific displines? How many credits do you need to graduate from a high school in Memphis TN?