The molecule is the smallest unit of the substance that retains its characteristic properties. The macromolecule is such a unit but is considerably larger than the ordinary molecule.
50/50 you see, the coin only has 2 sides Also, you're flipping it twice therefore, the probability is matched up and you have a 50/50 chance of getting heads at least 1 of those 2 times (Hope it helped ^_^)
