Question

maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. interview ten different people to determine which type of disinfectant they prefer. c. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Explanation:

To determine which disinfectant kills the most bacteria, a scientific experiment is needed. Option A relies on companies' opinions (biased), Option B on people's preferences (not about bacteria kill). Option C is a controlled experiment: same bacteria amount/species, identical plates, different disinfectants. This isolates the disinfectant variable to measure bacteria kill.

Answer:

C. Put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.