Use the above picture to fill in the blanks for the following statement. One of the element carbon combines with one of the element oxygen to form one of the compound carbon dioxide.

C + 2O CO2

Explanation:

"One" element of Carbon combines with "Two" elements of Oxygen, to form "One" compound of Carbon dioxide.

I didn't really get what you meant but this is my guess of what you meant

friction

explanation:

they us to move forward and backwards

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.