Atoms contain subatomic particles called protons and neutrons. When these protons and neutrons split, a lot of energy released

a displacement distance is size of displ

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over