What problems could arise if scientists use different units to measure height

Scientists can measure the height in different units but problem could arise when they compare all the measurements. That is the reason there is standard units for measurements.

There may be error arises when an American scientist is measuring the height of an object in inches and other Australian scientist is measuring the height of same object in meters. Their data cannot be compared because they are using different units to measure height.

C, Neutrons are inside the nucleus of an atom. Rutherford was able to theorize that if neutrons were in the center, and electrons were orbiting in separate energy levels, then protons must be in the nucleus to keep the neutrons bound and not free floating, and if the nucleus has neutral and positive particles, then it has to be a positive nucleus.