2. A component of nucleic acid that carries hereditary information in DNA in cells. Chemically, it is a pyrimidine base, but is only found in RNA molecules instead of thymine.

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?