The stem has more things to transport that's why it has more vascular bundles. The roots only get water from the ground and moving nutrients from the soil to transfer it to the stem. Having more vascular bundles helps the stems to transfer things to leaves and other parts of the plants.
The term used for the diffusion of water across a semipermeable membrane is called Osmosis
The nuclear equation that represents the fusion of two H-2 atoms to form He-3 and one neutron is

In a nuclear reaction the nuclides are represented with the chemical symbol preceded by a superscript that represents the mass number (number of protons plus neutrons) and a subscript that represents the atomic number (number of protons).
<h3>What is a Nuclear reaction ?</h3>
A nuclear reaction is a process in nuclear physics and nuclear chemistry where two nuclei or a nucleus and an outside subatomic particle meet to create one or more new nuclides. Consequently, at least one nuclide must change throughout a nuclear reaction.
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They have the same mass as the mass of the reactants. evidence to back this up is the law of conservation of mass
The first is A second is C