Which of the following is true about mechanical waves? A. Matter moves
B. Does not move energy
C. Moves energy
D. Does not require a medium

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.