Which term names the metamorphic change to a rock that results mainly from the heat energy of nearby magma? a. local metamorphism b. regional metamorphism c. contact metamorphism d. thermal metamorphism

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.

Idon't really understand this can you me and show your work.☺☺[ chemistry b] subject [ electron transfer in lonic bonds]grade( 12)

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5