The biological half-life of caffeine, the time required for the body to eliminate one-half of the total amount of caffeine, for an individual is 5 hours. Which statement about the amount of caffeine in the individual's body is correct?

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity