Is it possible to plant peas that have already been in a recently bought can?

Yes you can sweetheart, I planted string beans that were from a can and in a matter of days they grew

explanation:

yes you are doing it right great gob

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.