Which of the following characteristics, structures, or processes is common to both bacteria and viruses?
a) metabolism
b) ribosomes
c) genetic material composed of nucleic acid
d) cell division
e) independent existence

C is the most appropriate one.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.