What makes young herbaceous plant remain upright?

All organisms contribute some water to the water cycle by conducting

Most of the carbon on earth is stored in the form of

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