The standard base unit for length is the

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.