Why is newtons first law of motion important to science plsss help :(

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which position represents spring in the southern hemisphere? a) b) c) d)

Acontrol during an experiment. might change remains constant does not exist does change