What information would you need to find a more precise of dinosaurs and plants

Does masterbation affect height growth or loss of growth hormone?

Which would be the most useful source of evidence to support mcneill's contention?

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