According to the central dogma, what is the intermediate molecule involved in the flow of information in a cell that should go in the blank? dna → → proteins

The correct answer is RNA.  

The central dogma explains the flow of genetic information within a biological system. It is a simplified explanation for a gene expression. DNA is copied into mRNA during the process of transcription and the proteins are synthesized using the information in mRNA during the translation.

You could do a short story about a man who leaves his home full of energy and ready to go ( like oxinated blood leaving the hart) and the farther he walks away from is home the less energy he has. when he don with his walk he goes home to rest ( deoxinated blood going back to the hart) when he gets home he goes to his home he goes to the refrigerator and gets some food ( deoxinated blood goes to lungs) and the goes to bed to do the same thing later