The sun radiates energy through space and to the earths surface. most of this energy is in the part of the light spectrum. a. gamma ray b. visible c. microwave d. x-ray

Ineed with my science work! it’s due tomorrow!

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.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.