What makes a scientific theory unique?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Which type of landforms forms at the plate boundary as a result of divergent stress

Which was not a reason why canals were built in florida