During a biology lab practical, students were required to identify a metal by its density. all the metals were painted green so students could not use color as a factor to eliminate choices. carl computed the density of his sample metal to be 8.9 g/cm3. since carl's lab grade depended on his accuracy and correct identification of the sample metal, he was unsure which sample he had, nickel or copper. what would you tell carl about his density measurement? a) disregard any decimal points and use only whole numbers. b) 8.9 is closer to to 8.91 than 8.96 so carl should chose nickel. c) re-do the measurements, several times, and take the average density before making a decision. d) when using water displacement to find the volume, be sure to read the meniscus to the nearest 0.01 ml.