1st one 2nd one and i believe 3rd one
This answer is B because it is not made up of cells, the easiest way to know this is because viruses are much smaller than a single cell, meaning its impossible for it to have cells or be a living organism.
Cardiac Muscle, reason its called Cardiac attack when you have that sort of " Heart Attack "
Hydroxyapatite is the major component of bone that contributes to its hardness.
