Why do red pandas and giant pandas both eat bamboo? and is that have to do with dna or genes

They genetically aren't similar but they are related they are both part of the panda family therefore their diets will be the same.

The answer is nucleic acid 

Bunicellular.dinoflagellates are unicellular or multicellular, producers, and autotrophs, and apple trees are multicellular, producers, and autotrophs. all plants have numerous cells in them, so they can never be unicellular. the remaining characteristics they share with less complex organisms such as dinoflagellates.