Multicellular organisms are made up of different types of differentiated cells. Given that all cells in an organism have the same DNA—and thus the same genes—explain how it is that different genes can be expressed only in certain types of cells.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )