Fill in the blanks with the word that best completes each statement. Scientists develop knowledge by making -about the natural world that may lead to a scientific question. A scientific question may lead to a(n) -which can be tested. The results of -can lead to changes in scientific knowledge.

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.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood