How dose the atomic mass and atomic number compare for helium
a: helium does not have an atomic number
b: the atomic number is greater
c: the atomic mass is greater
d: the atomic mass and atomic number are equal

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?