Abdul swabs one of his sister’s arms with water. he swabs her other arm with rubbing alcohol. then he asks her to describe which feels cooler. why is abdul’s experiment not a scientific way of testing evaporation and cooling a. his sister’s opinion is not a verifiable observation? b. the amounts of water and alcohol are not the same?

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. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.