In what way are all living organisms earth similiar?

They all use the same set of nucleotides. The following nucleotide codes are A,C,G,T or U. In all  all living organisms on earth, we have this one thats why all are similiar.

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.