What biome does new york state belong too?

When analyzing tree rings, what do scientists assume a thin ring indicates?

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

What is the difference between a scientific hypotheses and a scientific theory?