Which is true of the phospholipid bilayer of the cell membrane?
a. there is a hydrophobic side inside the cell.
b. there is a water-fearing side inside the cell.
c. there is a water-loving side outside the cell.
d. there is a hydrophobic side outside the cell.

the answer to your question is tooth decay.

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.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

cells spend most of their time in interphase