Death of cardiac muscle cells is usually associated with that block or restrict blood flow to the coronary arteries.
inflammations
sickle cells
clots
all of the above

a

explanation:

because it is and it's just life man

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

c

explanation:

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.