The major relationship between protein and nucleic acid is the reproduction of DNA which contains the information on how cells are used together with RNA which helps to make protein. Both nucleic acid and protein they have four biomolecules which are common in both of them.
Short answer: Using a binary code, genes (DNA) specify how proteins (among other things) are to be synthesized.
Analogy: If DNA is a cooking book, genes are recipes, and proteins the dishes resulting from processing the recipe ingredients.
Water is warmed by the sun and is evaporated. It is then cooled down and condensed. Finally, it is brought back to Earth in the form of water droplets (Rain)
I hope it helps!^^ May the power of unicorns be with you!