Asubstance made up of two or more different elements joined by chemical bonds is called a(n)
a. compound
c. pure substance
b. atom
d. solution

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?