Who invented found that animals are composed of cells

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

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

In general, are there any major differences that you can see? explain