What structural feature of cells can allow molecules to flow directly from the inside of one cell to the inside of the next?

plasmodesmata

chloroplasts

cilia

plasmids

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?