The photograph shows a type of blood cell.
Which statements about these cells are correct?
1 Oxygen diffuses through the phospholipid bilayer.
2 Sodium ions diffuse through the phospholipid bilayer.
3 Water passes in and out of these cells by osmosis.

1 )
1 and 2 only
1 and 3 only
3 )
2 and 3 only
4 )
1, 2 and 3
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